6) The grams of the O₂ are used to produce 0.72 L of CO₂ gas at standard the temperature and the pressure is 0.10 g.
7) If 73 g of the aluminum chloride decomposes, the molecules of chlorine gas is 3.25 × 10²² molecules.
6) The chemical equation is as :
C₃H₈ + 5O₂ ----> 3CO₂ + 4H₂O
The ideal gas is as :
P V = n R T
Where,
The Pressure, P = 1 atm
The temperature, T = 273 K
The volume, V = 0.72 L
The gas constant, R = 0.823 L atm K⁻¹mol⁻¹
The moles, n = ?
n = P V / R T
n = ( 1 × 0.72 ) / 0.823 × 273
n = 0.0032 mol
The mass of the O₂ = moles × molar mass
The mass of the O₂ = 0.0032 × 32
The mass of the O₂ = 0.10 g
7) The chemical equation is :
2AICl₃ --> 2Al+ 3Cl₂
The mass of the AICl₃ = 73 g
The number of the moles of the AICl₃ = mass / molar mass
The number of the moles of the AICl₃ = 73 / 133.33
The number of the moles of the AICl₃ = 0.54 mol
The number of the molecules = 0.54 × 6.022 × 10²²
The number of the molecules of the AICl₃ = 3.25 × 10²² molecules.
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Gasohol is a mixture of gasoline and ethanol (grain alcohol), C2H5OH. Calculate the maximum work that could be obtained at 25C and 1 atm by burning 1 mole of ethanol,
C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)
The maximum work that could be obtained at 25°C and 1 atm by burning 1 mole of ethanol is 275.2 kJ/mol.
The maximum work that could be obtained by burning 1 mole of ethanol can be calculated using the Gibbs free energy change (ΔG) of the reaction. The equation for maximum work is:
w_max = -ΔG
To calculate ΔG, we need to know the standard free energy change (ΔG°) and the reaction quotient (Q). At standard conditions (25°C and 1 atm), the standard free energy change for the reaction is:
ΔG° = -123.5 kJ/mol
The reaction quotient Q can be calculated using the concentrations of the reactants and products:
Q = [CO₂]²[H₂O]³ / [C₂H₅OH][O₂]³
At equilibrium, Q = Kc, where Kc is the equilibrium constant. For this reaction, Kc = 0.37 at 25°C and 1 atm.
Using these values, we can calculate ΔG:
ΔG = ΔG° + RT ln(Q/Kc)
= -123.5 kJ/mol + (8.314 J/mol·K)(298 K) ln(1/Kc)
= -123.5 kJ/mol + (8.314 J/mol·K)(298 K) ln(2.7)
= -123.5 kJ/mol - 151.7 kJ/mol
= -275.2 kJ/mol
Finally, we can calculate the maximum work:
w_max = -ΔG
= 275.2 kJ/mol
Therefore, the maximum work that could be obtained at 25°C and 1 atm by burning 1 mole of ethanol is 275.2 kJ/mol.
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the molar solubility was calculated with and without a common ion. discuss the change in molar solubility after the common ion was added.
The molar solubility of a substance decreases when a common ion is added due to the common ion effect and the system's response according to Le Châtelier's principle. The system will shift to re-establish equilibrium, leading to a decrease in the dissolved substance's concentration and a decrease in molar solubility.
The molar solubility was calculated with and without a common ion, and we will discuss the change in molar solubility after the common ion was added.
In a solution, the molar solubility is the maximum amount of a substance that can dissolve in a given volume of solvent to form a saturated solution at a particular temperature. When there is no common ion present, the molar solubility is determined solely by the solubility product constant (Ksp) of the substance.
However, when a common ion is added to the solution, the molar solubility of the substance decreases. This decrease occurs due to the common ion effect, which is a consequence of Le Châtelier's principle.
According to Le Châtelier's principle, when a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will shift to counteract the imposed change and re-establish equilibrium.
When a common ion is added to the solution, the concentration of one of the ions in the equilibrium expression increases. As a result, the system will shift to counteract the increase in ion concentration, causing the reaction to proceed in the reverse direction.
This leads to a decrease in molar solubility, as more of the substance will remain undissolved in the presence of the common ion.
In summary, the molar solubility of a substance decreases when a common ion is added due to the common ion effect and the system's response according to Le Châtelier's principle. The system will shift to re-establish equilibrium, leading to a decrease in the dissolved substance's concentration and a decrease in molar solubility.
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63) In human muscle cells, fermentation (by itself) producesA) lactate.B) adenosine triphosphate.C) water.D) pyruvate.
In human muscle cells, fermentation (by itself) produces lactate. During high-intensity exercise, the demand for ATP increases, and the oxygen supply may not be able to meet the energy requirements. Option(A)
In such conditions, the glucose breakdown continues through glycolysis, producing pyruvate, which gets converted into lactate by the enzyme lactate dehydrogenase (LDH). This reaction generates NAD+ from NADH, which is required to keep glycolysis going, enabling the production of ATP.
Accumulation of lactate in muscles can lead to fatigue, soreness, and cramps. Lactate can also be transported to other organs like the liver, where it can be converted back to glucose through gluconeogenesis.
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mse how many phases are contained in the sugar water? (ignore the container; consider just the liquid sugar water.)
Sugar water is a mixture that contains only one phase.
This means that it is a uniform and homogeneous solution in which the sugar molecules are evenly spread out throughout the water molecules, forming a single liquid phase.
The sugar molecules get dissolved in the water, and this creates a solution that has uniform properties throughout. Because of this uniformity, there is no separation or distinction between different phases in sugar water.
In simple terms, you can think of sugar water as a single, smooth mixture that looks and behaves the same throughout, with no visible differences or separate layers.
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Comment on the sp separation in F, what is the consequence of this?
The sp separation in F results in a highly polar covalent bond, with significant charge separation between the two atoms.
Fluorine (F) has a ground-state electron configuration of 1s²2s²2p⁵, with seven valence electrons. In order to achieve a stable octet, fluorine forms a single covalent bond with another fluorine atom, resulting in the formation of F₂.
The valence electrons of each fluorine atom occupy the two 2p orbitals and one 2s orbital, resulting in hybridization of these orbitals to form two sp hybrid orbitals. The sp orbitals point towards each other, and the two atoms share a pair of electrons in the region of overlap.
The electronegativity difference between the two fluorine atoms results in a highly polar covalent bond, with the electrons being more strongly attracted to the more electronegative atom. In the case of F₂, the electron density is shifted towards the more electronegative fluorine atom, resulting in a partial negative charge on that atom and a partial positive charge on the other fluorine atom.
This separation of charges is known as a dipole moment and gives rise to the molecule's polarity. The consequence of this polarity is that F₂ is highly reactive, and the molecule readily participates in chemical reactions, particularly with other highly electronegative atoms or molecules.
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How do fatigued human muscle cells repay an "oxygen debt"?The cells increase production of ATP.The cells produce more oxygen.The cells decrease CO2 production.The cells convert glucose to pyruvate.The cells convert lactate back to pyruvate.
Human muscle cells in fatigue pay back a "oxygen debt" by reverting lactate to pyruvate. Intense exercise causes muscles to utilize more oxygen than body is able to provide, which causes them to start producing lactate as a consequence of anaerobic metabolism.
This causes a buildup of lactate and a drop in pH in muscles, which can both contribute to muscle tiredness. This "oxygen debt" must be paid back by the body after exercise by metabolizing lactate and resetting the pH equilibrium in the muscles. The Cori cycle, which entails converting lactate back into pyruvate in liver, pyruvate being converted to glucose, and then the release of glucose into the bloodstream for utilization as energy by the muscles, achieves this.
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which carbons are responsible for the resonances at 174.6, 143.6 and 80.2 ppm in benzilic acid? assign each resonance
The resonances at 174.6, 143.6, and 80.2 ppm in benzilic acid correspond to the carbonyl carbon of the carboxylic acid group, the α-carbon of the carboxylic acid group, and the carbon atoms directly attached to the oxygen atoms in the benzene rings, respectively.
How to find the resonances in benzilic acid?In benzilic acid, there are several carbon atoms that can be responsible for the resonances at 174.6, 143.6, and 80.2 ppm.
The resonance at 174.6 ppm corresponds to the carbonyl carbon of the carboxylic acid group (-COOH) in benzilic acid.
The resonance at 143.6 ppm corresponds to the carbon atom adjacent to the carbonyl carbon in the carboxylic acid group, which is also called the α-carbon. This carbon is directly bonded to the carboxylic acid group and to one of the benzene rings in the molecule.
The resonance at 80.2 ppm corresponds to the carbon atoms in the benzene rings of benzilic acid. Specifically, this resonance corresponds to the carbon atoms that are directly attached to the oxygen atoms in the carboxylic acid group.
Therefore, the resonances at 174.6, 143.6, and 80.2 ppm in benzilic acid correspond to the carbonyl carbon of the carboxylic acid group, the α-carbon of the carboxylic acid group, and the carbon atoms directly attached to the oxygen atoms in the benzene rings, respectively.
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The primary target for shaped charge munitions is
The primary target for shaped charge munitions is armored vehicles.
Shaped charge munitions are designed to penetrate armor, making them particularly effective against armored vehicles. The warhead of a shaped charge contains a cone-shaped metal liner, usually made of copper, that is surrounded by explosives.
When the explosives are detonated, they create a high-velocity jet of molten metal that can penetrate even the thickest armor. The shape of the liner and the design of the explosives are carefully calibrated to maximize the effectiveness of the jet, making shaped charges much more effective at penetrating armor than conventional explosive charges.
While shaped charges can also be used against other targets, such as buildings or bunkers, their primary purpose is to defeat armored vehicles. This makes them a valuable tool for ground forces facing armored opponents, as well as for aircraft and helicopters targeting ground vehicles.
In recent years, shaped charges have been used extensively in conflicts such as the Gulf War, the Iraq War, and the Syrian Civil War, where armored vehicles have played a significant role.
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why is the C-N peptide bond relatively rigid?
The C-N peptide bond is relatively rigid due to its partial double bond character. The peptide bond is formed between the carbonyl group of one amino acid and the amino group of another amino acid during protein synthesis.
The carbonyl carbon atom is sp2 hybridized, and the nitrogen atom is sp3 hybridized. Due to the resonance of the lone pair of electrons on the nitrogen atom, the peptide bond has partial double bond character, which means that the bond has a significant amount of double bond character, resulting in restricted rotation around the bond.
The double bond character of the C-N peptide bond makes it less flexible and less likely to rotate freely. Additionally, the peptide bond is planar, which restricts rotation even further. This rigidity of the C-N peptide bond plays a crucial role in determining the overall conformation of the protein backbone, as it limits the possible angles at which adjacent amino acids can be connected.
The rigid peptide bond, combined with the various angles at which the bond can be formed, results in the formation of the alpha helix, beta sheets, and other secondary structures in proteins.
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Physical or chemical change? Fish in the fridge smelling more 'fishy' with time.
The smell of the fish in the fridge becoming more fishy with time is a result of a chemical change.
The change in smell of the fish in the fridge is a chemical change. As the fish begins to decompose, its proteins break down into smaller molecules such as amines, which are responsible for the strong fishy odor. This breakdown process is a chemical reaction that cannot be reversed, making it a chemical change.
A physical change, on the other hand, involves a change in the physical appearance of the substance, such as a change in shape or state, but the chemical makeup of the substance remains the same.
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2c2h6 7o2 -> 6h2o 4co2. 1.45 g c2h6 was burned in the presence of 4.50 g o2. determine the limiting reactant
The limiting reactant is C2H6.
To determine the limiting reactant, we need to compare the number of moles of C2H6 and O2 available for the reaction. The balanced chemical equation is:
2C2H6 + 7O2 -> 6H2O + 4CO2
From the equation, we can see that 2 moles of C2H6 react with 7 moles of O2. So, we need to calculate the number of moles of C2H6 and O2 available:
Number of moles of C2H6 = 1.45 g / 30.07 g/mol = 0.048 mol
Number of moles of O2 = 4.50 g / 32.00 g/mol = 0.141 mol
Now, we can compare the number of moles of C2H6 and O2. The limiting reactant is the one that is totally consumed, while the other reactant is in excess.
From the calculations above, we can see that we have less moles of C2H6 than O2. Therefore, C2H6 is the limiting reactant.
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ch 13 the rate constant for a reaction at 25 C is .010s and its activation energy is 35.8 kJ. what is the rate constant at 50C?
a. .021
b. .010
c. .003
d. .031
The rate constant at 50°C is approximately 0.021 s⁻¹. The answer is a.
The Arrhenius equation relates the rate constant of a reaction to its activation energy and temperature:
[tex]k = Ae^{(-Ea/RT)[/tex]
where k is the rate constant, Ea is the activation energy, R is the gas constant (8.314 J/mol•K), T is the temperature in Kelvin, and A is the pre-exponential factor, which is a constant that depends on the specific reaction.
To find the rate constant at 50°C, we need to convert the temperature to Kelvin:
T = 50°C + 273.15 = 323.15 K
We can then use the Arrhenius equation and the given values to solve for the rate constant at 50°C:
[tex]k_2 = Ae^_(-Ea/RT_2)[/tex]
[tex]= (0.010 s^{-1})e^{(-35,800 J/mol / (8.314 J/mol•K * 323.15 K))[/tex]
= 0.021 s⁻¹
Therefore, the rate constant at 50°C is approximately 0.021 s⁻¹, which corresponds to option A.
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Which Hazardous Material class includes compressed gases, dissolved gases, and gases liquefied by compression or refrigeration?
The Hazardous Material class that includes compressed gases, dissolved gases, and gases liquefied by compression or refrigeration is Class 2: Gases. This class is further divided into three divisions:
1. Division 2.1 - Flammable Gases: These are gases that can burn in the presence of an ignition source. Examples include propane, butane, and hydrogen.
2. Division 2.2 - Non-Flammable, Non-Toxic Gases: These are gases that do not burn and are not toxic, but may still pose risks due to their physical properties, such as high pressure or low temperature. Examples include nitrogen, helium, and carbon dioxide.
3. Division 2.3 - Toxic Gases: These are gases that are harmful or even fatal when inhaled. Examples include chlorine, ammonia, and phosgene.
The proper handling, storage, and transportation of these gases are essential to minimize the risks associated with their hazardous properties. Regulations and guidelines are in place to ensure the safety of those working with and around these materials.
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A 0.100 m solution of which one of the following solutes will have the highest vapor pressure?
a. Al(ClO4)3
b. Cl(ClO4)2
c. NaCl
d. KClO4
e. sucrose
The 0.100 m solution with the highest vapor pressure among the following solutes will be:
a. Al(ClO₄)₃
b. Cl(ClO₄)₂
c. NaCl
d. KClO₄
e. sucrose
Correct answer: e. sucrose
Here's a step-by-step explanation:
1. Vapor pressure is inversely proportional to the number of solute particles in the solution. The more solute particles, the lower the vapor pressure.
2. Determine the number of particles produced by each solute when it dissolves in water.
a. Al(ClO₄)₃ → 1 Al³⁺ + 3 ClO₄⁻ (4 particles)
b. Cl(ClO₄)₂ → 1 Cl⁺ + 2 ClO₄⁻ (3 particles)
c. NaCl → 1 Na⁺ + 1 Cl⁻ (2 particles)
d. KClO₄ → 1 K⁺ + 1 ClO₄⁻ (2 particles)
e. sucrose (C₁₂H₂₂O₁₁) → 1 sucrose molecule (1 particle)
3. The solution with the least number of solute particles will have the highest vapor pressure. In this case, it's sucrose with only 1 particle.
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olestra is not metabolized because the additional fatty acid units block the approach of digestive enzymes to the cleavage sites.
how many dietary calories does a 1 gram sample of olestra contribute to a human consumer?
a) 0
b) 4
c) 5
d) 9
A 1 gram sample of Olestra would contribute 0 dietary calories to a human consumer because Olestra is not metabolized by the human body due to the additional fatty acid units that block the approach of digestive enzymes to the cleavage sites. The correct answer is (a) 0.
Olestra, also known as Olean, is a fat substitute that was developed to replace traditional fats in food products. Unlike traditional fats, Olestra is not metabolized by the human body because the additional fatty acid units in its molecular structure block the approach of digestive enzymes to the cleavage sites.
Therefore, it passes through the digestive system without being absorbed or broken down into calories. The correct answer is 0.
This means that Olestra is not absorbed in the small intestine and passes through the digestive system without being broken down into calories.
As a result, Olestra has a negligible caloric value and does not contribute to the overall calorie content of the food products in which it is used. This makes it an attractive alternative to traditional fats for food manufacturers who want to reduce the calorie content of their products without sacrificing taste or texture.
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What is the rule we must follow to exceed the octet rule?
To exceed the octet rule, you need to consider the following points:
1. The element involved should be from Period 3 or higher in the periodic table. These elements have access to d-orbitals, allowing them to accommodate more than eight electrons in their valence shell.
2. The additional electrons must be added to the available d-orbitals to form expanded octets.
3. Exceeding the octet rule typically occurs when an element forms covalent bonds with highly electronegative elements such as oxygen or fluorine.
In summary, to exceed the octet rule, you must involve elements from Period 3 or higher that have access to d-orbitals and form covalent bonds with highly electronegative elements.
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What intermediate is believed to occur in the elimination-addition nucleophilic aromatic substitution mechanism on benzene?
In the elimination-addition nucleophilic aromatic substitution mechanism on benzene, a sigma complex intermediate is believed to occur.
The sigma complex intermediate is formed when the nucleophile attacks the benzene ring, displacing a leaving group and forming a cyclic intermediate. The cyclic intermediate contains a sp^3 hybridized carbon atom, which is stabilized by delocalization of the electrons in the benzene ring. The cyclic intermediate then undergoes a series of rearrangements and eliminations to give the final substitution product.
The sigma complex intermediate is an important feature of the elimination-addition mechanism, as it allows for the retention of aromaticity during the reaction. The formation of the intermediate breaks the aromaticity of the benzene ring, but the subsequent rearrangements and eliminations restore the aromaticity of the ring, which is an energetically favorable state.
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you mix 52 ml of 0.75 m nitric acid with 0.849 g of solid magnesium. by how much does the temperature increase? assume that the enthalpy of the reaction is -462.0 kj
When 52 ml of nitric acid is taken, then the temperature increases by 41.34 C.
The reaction between nitric acid and magnesium is shown as,
Mg + 2HNO₃ → H₂ + Mg(NO₃)₂
Given
Volume of nitric acid = 52 ml
Molarity of nitric acid = 0.75 M
Mass of solid magnesium= 0.849 gm
Enthalpy of the reaction is = -462.0 kJ/mol
First, the moles of nitric acid are calculated as,
Moles = molarity × volume
= 0.75 M × 52 ÷ 1000
= 0.039 mol
Secondly, the moles of magnesium is calculated as,
Moles = mass ÷ molar mass
= 0.849 ÷ 24.30
= 0.0349
In the reaction, nitric acid is the limiting reagent that affects and controls the formation of magnesium ions.
2 mol HNO₃ → 1 mol Mg ions
1 mol of HNO₃ = 0.5 mol Mg ions
So, 0.039 mol of HNO₃ will result in 0.0195 moles of Mg ions.
It is known that 1 mol of magnesium ion releases 462.0 kJ/mol.
Therefore, the heat is calculated as:
= 462 × 10³ J/mol × 0.0195 mol
= 9009 J
Lastly, the increase in the temperature is given as:
q = mcΔT
9009 J = (52+0.849) × 4.184 J/ g°C × Δ T
9009 = 217.92 × ΔT
ΔT = 9009 ÷ 217.92 °C
= 41.34 °C
Therefore, the temperature increases by 41.34 °C.
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How many atoms are there in 284 grams of methane gas (CH4)?
Answer:To determine the number of atoms in 284 grams of methane gas (CH4), we need to use the molar mass of CH4 and Avogadro's number.The molar mass of CH4 is 12.01 + 4(1.01) = 16.05 g/mol.Avogadro's number is the number of particles (atoms, molecules, etc.) in one mole of a substance, and is equal to 6.022 x 10^23 particles/mol.To calculate the number of atoms in 284 grams of CH4, we can use the following steps:Convert the mass of CH4 to moles:Number of moles = Mass / Molar mass
Number of moles = 284 g / 16.05 g/mol = 17.68 molCalculate the number of atoms using Avogadro's number:Number of atoms = Number of moles x Avogadro's number
Number of atoms = 17.68 mol x 6.022 x 10^23 atoms/mol = 1.064 x 10^25 atomsTherefore, there are approximately 1.064 x 10^25 atoms in 284 grams of methane gas (CH4)
Explanation:
NO2(OH) dissolved in water and produced an acidic solution, and Ni(OH)2 dissolved only in an acidic solution. What type of compounds were these?A. Both were oxyacids.B. Both were bases.C. NO2(OH) was a base and Ni(OH)2 was an oxyacid.D. NO2(OH) was an oxyacid and Ni(OH)2 was a base.
[tex]NO_{2} (OH)[/tex] is a base and [tex]Ni(OH)_{2}[/tex] is a basic oxide that dissolves only in an acidic solution. Option D is correct.
In light of the given data, we can presume that [tex]NO_{2} (OH)[/tex] is a base and [tex]Ni(OH)_{2}[/tex] is an essential oxide.[tex]NO_{2} (OH)[/tex] is probably going to be a feeble base that goes through halfway ionization in water, prompting the development of hydronium particles [tex](H_{3} O^{+} )[/tex] and nitrite particles ([tex]NO_{2}^{-}[/tex]).
Since the arrangement is acidic, this proposes that the centralization of [tex]H_{3} O^{+[/tex]particles is more prominent than that of the [tex]OH^-[/tex] particles.Then again, [tex]Ni(OH)_{2}[/tex] is an essential oxide that responds with an acidic answer for structure nickel particles [tex](Ni_{2} ^{+} )[/tex] and water ([tex]H_{2} O[/tex]). This response demonstrates that [tex]Ni(OH)_{2}[/tex] is a base that can kill a corrosive.
In this manner, we can presume that [tex]NO_{2} (OH)[/tex] is a base and [tex]Ni(OH)_{2}[/tex] is an essential oxide, which is a sort of base that responds with a corrosive to frame water and a salt. In light of this, choice D is the right response.
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will the Keq increase or decrease if all the SCN- was not completely converted into FeSCN as assumed in part 1?
If all the SCN⁻ was not completely converted into FeSCN as assumed in part 1, K(eq) increases.
Generally, for a chemical reaction, the equilibrium constant can be described as the ratio between the amount of reactant and the amount of product that is used to determine the chemical behavior of the chemical reaction. Basically at a particular temperature, the rate constants are constant.
Fe³⁺ + SCN⁻ ⇄ [FeSCN]²⁺
Keq = [FeSCN]²⁺ / ([SCN⁻][Fe³⁺])
If [SCN⁻] was not completely changed Keq decreases. If [SCN⁻] completely changed [SCN⁻] decreases and hence Keq increases.
Hence, in case of incomplete reaction equilibrium constant increases.
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Which protein has the highest electrophoretic mobility in SDS-PAGE under non-reducing conditions? (Note: There are no disulfide interactions unless stated in the table.)Protein 1 32 kDa monomerProtein 2 Disulfide-linked homodimer comprised of 19 kDa monomersProtein 3 Homotrimer comprised of 25 kDa monomersProtein 4 Homodimer comprised of 38 kDa monomers
Since there are no disulfide interactions, the protein with the highest electrophoretic mobility in SDS-PAGE under non-reducing conditions would be the smallest monomer, which is Protein 1 with a molecular weight of 32 kDa.
The other proteins are larger and/or have complex structures such as trimers and dimers, which would result in slower mobility through the gel compared to Protein 1.
SDS-PAGE (Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis) is a common technique used in biochemistry to separate proteins based on their size. In this technique, proteins are denatured by treatment with SDS, which is a detergent that disrupts non-covalent interactions and unfolds the protein. The SDS also imparts a negative charge to the protein, which allows it to migrate towards the positive electrode during electrophoresis.
During electrophoresis, the protein sample is loaded into a polyacrylamide gel matrix that acts as a molecular sieve.
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How many joules are required to convert 325g of water at 12 degrees Celsius to steam at 176 degrees Celsius
Explanation:
How many joules are required to convert 325g of water at 12 degrees Celsius to steam at 176 degrees Celsius
To calculate the energy required to convert a given mass of water from a lower temperature to steam at a higher temperature, we need to consider two processes: (1) heating the water from its initial temperature to its boiling point, and (2) vaporizing the water at its boiling point to steam at the final temperature.
The amount of heat required for each process can be calculated separately using the following formulas:
(1) Q1 = m * c * ΔT
(2) Q2 = m * L
where Q1 is the heat required to raise the temperature of the water, Q2 is the heat required for the water to vaporize, m is the mass of water, c is the specific heat of water, ΔT is the temperature change, and L is the heat of vaporization of water.
Given:
Mass of water (m) = 325 g
Initial temperature of water = 12°C
Final temperature of steam = 176°C
Specific heat of water (c) = 4.184 J/g°C
Heat of vaporization of water (L) = 2260 J/g (at standard pressure)
To find the energy required to convert 325g of water at 12°C to steam at 176°C, we need to calculate Q1 and Q2 separately and then add them together.
(1) Heating the water:
Q1 = m * c * ΔT
Q1 = 325 g * 4.184 J/g°C * (100°C) [since the boiling point of water is 100°C at standard pressure]
Q1 = 136292 J
(2) Vaporizing the water:
Q2 = m * L
Q2 = 325 g * 2260 J/g
Q2 = 735500 J
Total heat required = Q1 + Q2
Total heat required = 136292 J + 735500 J
Total heat required = 871792 J
Therefore, it would require 871792 J of energy to convert 325g of water at 12°C to steam at 176°C.
how many grams of oxygen, o2 are produced if 74.0g of potassium chlorate, kclo3, decomposes? (the molar mass of o2
29 grams [tex]O_2[/tex] are produced if 74g of potassium chlorate is decomposed. 2 moles of Potassium chlorate decompose to give 2 moles of KCl and 3 moles of oxygen.
Potassium chlorate on decomposition follows the below equation:
2[tex]KClO_3[/tex] -------Δ-------> 2KCl + 3[tex]O_2[/tex]
Therefore, using stoichiometry, we get:
On the decomposition of 244.8 g of potassium chlorate, 96 g of oxygen is produced. (molar mass of potassium chlorate = 122.4 g and of oxygen = 32g)
Therefore, on the decomposition of 1 g of potassium chlorate, [tex]\frac{96}{244.8}[/tex] g of oxygen is produces
Hence, the decomposition of 74 g of potassium chlorate produces [tex]\frac{96}{244.8}*74[/tex] g of oxygen which comes out to be approximately 29 g of oxygen.
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A liter of air contains 9.2 × 10^−4 mol argon. What is the mass of Ar in a liter of air?
The molar mass of argon (Ar) is 39.95 g/mol or 0.0368 g
First, we need to determine the molar mass of argon, which is found by adding up the atomic masses of its constituent atoms. From the periodic table, we see that the atomic mass of argon is 39.95 g/mol.
Next, we can use the given number of moles of argon (9.2 × 10⁻⁴ mol) and the molar mass of argon to calculate the mass of argon present in one liter of air:
mass of Ar = number of moles of Ar × molar mass of Ar
mass of Ar = 9.2 × 10⁻⁴ mol × 39.95 g/mol
mass of Ar = 0.0368 g
Therefore, the mass of argon in one liter of air is 0.0368 g.
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In 1.00 L of solution, 0.529 mole of HNO2 is added to 0.246 mole of NaOH. (Nitrous acid has a Ka of 4.0 x 10¯4.) What is the final pH?
The final pH of the solution is 1.75.The reaction between nitrous acid (HNO2) and sodium hydroxide (NaOH) can be written as:
HNO₂ + NaOH → NaNO₂ + H₂ O
We can use the balanced equation to determine the moles of HNO₂ that react with NaOH. Since NaOH is a strong base, it will react completely with HNO₂, so we can assume that the amount of NaOH remaining after the reaction is negligible.
Moles of HNO₂ = 0.529 mol
Moles of NaOH = 0.246 mol
Since HNO₂ is a weak acid, it will partially dissociate in water according to the equation:
HNO₂ + H₂O ⇌ H₃O+ + NO2-
The equilibrium constant (Ka) for this reaction is 4.0 x 10¯⁴.
We can use the initial moles of HNO2 and the Ka value to determine the concentration of H₃O at equilibrium.
Ka = [H₃O+][NO₂-] / [HNO₂]
Assuming x moles of HNO2 dissociate, we get:
Ka = [H₃O] * [NO2-] / [HNO₂ - x]
At equilibrium, [HNO₂] = 0.529 - x
[NO₂-] = x
[H₃O] = x
Substituting these values in the equilibrium constant expression and solving for x, we get:
4.0 x 10¯⁴ = x² / (0.529 - x)
Solving for x gives x = 0.0179 M.
Therefore, the concentration of H₃O at equilibrium is 0.0179 M, and the pH is:
pH = -log[H₃O]
pH = -log(0.0179)
pH = 1.75
Therefore, the final pH of the solution is 1.75
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The three collagen chains are twisted around each other to form what?
The three collagen chains are twisted around each other to form a triple helix structure. This triple helix is also known as a tropocollagen molecule, which is the basic building block of collagen fibers.
The three chains, also known as alpha chains, are held together by hydrogen bonds and hydrophobic interactions. The triple helix structure provides collagen with its unique properties such as strength, flexibility, and resistance to deformation.
The arrangement of the chains also allows for the formation of cross-links between tropocollagen molecules, which gives collagen fibers even greater strength and stability.
The triple helix structure is essential to the function of collagen in the body, as it allows for the formation of strong connective tissues like tendons, cartilage, and bone. Any disruption to the triple helix can lead to collagen disorders, which can have significant effects on health and well-being.
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What is the correct formula that would
result from the combination of the two ionic species?
Na^1+ and l^1-
A: Nal
B: lNa
In the titration of 25 ml of 0. 567 m acetic acid with 0. 432 m naoh what is the ph at the equivalence point? ka = 1. 8 x 10-5 (for acetic acid)
The pH at the equivalence point is 4.48.
In this problem, we can use the Henderson-Hasselbalch equation to find the pH at the equivalence point. The Henderson-Hasselbalch equation is;
pH = pKa + log([A⁻]/[HA])
where pKa is the acid dissociation constant of the acid, [A⁻] is the concentration of the conjugate base, and [HA] is the concentration of the acid.
Now, we can calculate the concentration of the conjugate base at the equivalence point;
moles of acetic acid = concentration x volume = 0.567 mol/L x 0.025 L = 0.01418 mol
moles of NaOH added = concentration x volume = 0.432 mol/L x volume
At the equivalence point, moles of acetic acid = moles of NaOH added, so;
0.01418 mol = 0.432 mol/L x volume
volume = 0.0328 L
The total volume of the solution at the equivalence point is the sum of the volumes of acetic acid and NaOH solutions;
[tex]V_{total}[/tex] =[tex]V_{(aceticacid)}[/tex] + [tex]V_{(NaOH)}[/tex] = 0.025 L + 0.0328 L
= 0.0578 L
The concentration of acetate ion at equivalence point is;
[acetate] = moles of acetate / [tex]V_{total}[/tex] = 0.01418 mol / 0.0578 L = 0.245 M
Now we can use the Ka expression for acetic acid to find the pKa;
Ka = [H⁺][CH₃COO⁻]/[CH₃COOH] = 1.8 x 10⁻⁵
At equilibrium, the concentration of H+ equals the concentration of acetate ion;
[H⁺] = [acetate] = 0.245 M
Substituting these values into the Ka expression and solving for [CH₃COOH], we get;
1.8 x 10⁻⁵ = (0.245)² / [CH₃COOH]
[CH₃COOH] = (0.245)² / 1.8 x 10⁻⁵
= 3.34 M
Now we can use the Henderson-Hasselbalch equation to find the pH at the equivalence point;
pH = pKa + log([A⁻]/[HA]) = pKa + log(1) = pKa
pH = -log(3.34 x 10⁻⁵)
= 4.48
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ch 11. which one of these substances is a liquid at room temperature?
a. CH3OH
b. CF4
c.SiH4
d.CO2
CH[tex]_3[/tex]OH is a liquid at room temperature. Therefore, the correct option is option A.
A liquid comprises an almost incompressible fluid with an almost constant volume regardless of pressure that adapts to the form of its container. It constitutes one among the four basic forms of matter and the only one that has a known volume but no set shape. A liquid typically has a density that is higher than a gas and comparable to a solid. Condensed matter so refers to both liquid and solid. On the opposite hand, since both liquids and gases may flow, therefore are both referred to as fluids. CH[tex]_3[/tex]OH is a liquid at room temperature.
Therefore, the correct option is option A.
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