2502(g) + O. (g) = 2S0 (g) + 392 kJ


Determine the amount of heat released by the production of 1. 0 mole of SO3 (g)

Both mass and charge are conserved. Therefore, option (3) is correct.

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s) conserves mass and charge.

The rule of conservation of mass prohibits matter creation or destruction during chemical reactions. The reactants and products must have the same mass. The left and right sides of the reaction must have the same mass of iron (Fe) and copper sulfate (CuSO₄).

Redox processes also involve electron transfer. The law of charge conservation asserts that reactants and products must have equal charges. Iron loses electrons to generate Fe²⁺ ions, while copper ions receive electrons to form copper metal (Cu). The reaction is neutral.

Learn more about redox reaction, here:

https://brainly.com/question/28300253

#SPJ12

The Michaelis-Menten equation is used to describe the relationship between the rate of an enzymatic reaction and the substrate concentration. The equation is as follows:

v = (Vmax [S]) / (Km + [S])

where v is the initial velocity of the reaction, Vmax is the maximum velocity of the reaction, [S] is the substrate concentration, and Km is the Michaelis constant.

Km represents the substrate concentration at which the enzyme reaction rate is half of its maximum rate (Vmax). It is a measure of the affinity of the enzyme for its substrate. The units of Km depend on the units used for [S] and Vmax in the equation.

In the given scenario, V (initial) = 0.5 (Vmax), which means the initial reaction rate is half of the maximum reaction rate. Therefore, the substrate concentration at this point is equal to Km. As Km is a measure of substrate concentration, its units will be the same as the units of the substrate concentration, which can vary depending on the context.

Visit here to learn more about Michaelis-Menten equation brainly.com/question/30756012

#SPJ11

The volume of 2. 30 moles of gas exerting a pressure of 2. 80 atm at 155°C is 84.7 L.

We can use the ideal gas law to solve for the volume:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature to Kelvin:

155°C + 273.15 = 428.15 K

Next, we can plug in the values and solve for V:

V = (nRT) / P

V = (2.30 mol * 0.08206 Latm/molK * 428.15 K) / 2.80 atm

V = 84.7 L

Therefore, the volume of 2.30 moles of gas exerting a pressure of 2.80 atm at 155°C is 84.7 L.

To know more about the ideal gas law refer here :

https://brainly.com/question/28257995#

#SPJ11

By making a simple division of the Molar concentrations. The correct option is a.

The equilibrium constant Kc is a measure of the equilibrium between the forward and reverse reactions of a chemical reaction. It is a ratio of the concentrations of the products to the concentrations of the reactants at equilibrium.

The equilibrium constant Kc:

Kc = [products]/[reactants]

here [products] is the concentration of the products at equilibrium and [reactants] is the concentration of the reactants at equilibrium.

If the concentrations of the products and reactants are given in molar concentrations (M), we can express the equilibrium constant as a ratio of Molar concentrations using the following equation:

Kc = [products]M / [reactants]M

Therefore, to find the equilibrium constant Kc, we simply need to divide the Molar concentrations of the products and reactants by their respective coefficients.

Therefore, the correct option is a) by making a simple division of the Molar concentrations.  

Learn more about Molar concentrations Visit: brainly.com/question/26255204

#SPJ4

Correct Question:

The equilibrium constant Kc is found:

a) by making a simple division of the Molar concentrations

b) with the quotient of the speed of the products over the reactants

c) dividing the speeds of the equations that form the chemical reaction

d) with the quotient of the concentrations of the substances present in the equation​

In order to produce the impact of future droughts that may occur in the area, the scientist's plan would most likely include several key elements.

First and foremost, the plan would likely involve extensive research and data analysis to better understand the climate patterns and environmental factors that contribute to drought in the region.

This could involve collecting and analyzing data on rainfall, temperature, humidity, and other key indicators, as well as examining the impact of human activity on the local ecosystem.

Based on this research, the scientist may develop a range of strategies aimed at mitigating the effects of drought, such as water conservation measures, alternative irrigation techniques, and improved crop management practices.

Additionally, the plan may involve community outreach and education initiatives to raise awareness about the importance of water conservation and sustainable resource management.

Overall, the scientist's plan would likely be a comprehensive and multi-faceted approach aimed at preparing the city for future droughts and promoting long-term resilience and sustainability.

To know more about droughts refer here: https://brainly.com/question/26693108#

#SPJ11

The process of carbon dioxide getting into the atmosphere primarily occurs through natural processes like respiration, volcanic eruptions, and decay of organic matter.

However, human activities like burning of fossil fuels and deforestation have significantly increased the levels of carbon dioxide in the atmosphere. When these fuels are burned, they release carbon dioxide into the air, which contributes to the greenhouse effect, trapping heat in the atmosphere and leading to global warming. Additionally, deforestation reduces the number of trees that absorb carbon dioxide through photosynthesis, further exacerbating the problem.

Overall, the process of carbon dioxide getting into the atmosphere is a complex interaction between natural and human-induced factors that have significant impacts on our planet.

For more questions on: atmosphere

https://brainly.com/question/31359226

#SPJ11

The molarity of the solution is 0.5 M.

To calculate the molarity of the solution, we need to first calculate the number of moles of NaF present in the solution. The molar mass of NaF is 41.99 g/mol (22.99 g/mol for Na and 19.00 g/mol for F).

Number of moles of NaF = mass of NaF / molar mass of NaF

= 15.1 g / 41.99 g/mol

= 0.359 mol

The volume of the solution is given as 550.0 mL, which needs to be converted to liters (L) as the unit of molarity is moles/L.

Volume of the solution = 550.0 mL = 0.5500 L

Molarity of the solution = number of moles of solute / volume of solution

= 0.359 mol / 0.5500 L

= 0.653 M

However, we need to consider that the NaF was diluted to a final volume of 550.0 mL, which means that the concentration of the solution has been decreased. Therefore, we need to divide the calculated molarity by 2.

Molarity of the solution after dilution = 0.653 M / 2

= 0.5 M

To know more about molarity, refer here:

https://brainly.com/question/30404105#

#SPJ11

Answer:

This is thermodynamics.

Using simple thermodynamics operation equation

Answer:1.8

Explanation:

=nrt/v

P=(3.15)(.0821)(472)/67

P=1.82atm

The number of calories in 3 grams of peanuts, based on the given data, is approximately 10.88 calories. The correct answer is (c) 10.88 cal.

To calculate the number of calories in 3 grams of peanuts, we need to use the data collected from the experiment and apply the following formula:

calories = (mass of substance burned × specific heat of water × temperature change of water) ÷ volume of water

We are given that the mass of peanut burned was 0.75 g, the volume of water heated was 50 mL, and the temperature change of water was 14.5 °C.

The specific heat of water is 1 calorie per gram per degree Celsius (1 cal/g°C).

Substituting the given values into the formula, we get:

calories = (0.75 g × 1 cal/g°C × 14.5 °C) ÷ 50 mL

calories = 10.88 cal

to know more about calories refer here:

https://brainly.com/question/29096838#

#SPJ11

Student 1 and Student 3 both provide incorrect explanations for the increase or decrease in entropy during dissolution reactions. Option A is correct.

Student 1 suggests that the entropy increased for ammonium nitrate but decreased for sodium hydroxide, based on the number of species introduced to water, which is not a valid explanation. Student 3 suggests that the entropy decreased for both ammonium nitrate and sodium hydroxide due to the salts becoming more ordered, which is also incorrect.

On the other hand, Student 2 provides the correct scientific reasoning. According to the second law of thermodynamics, dissolution reactions always result in an increase in entropy. As the solid dissolves, the molecules become more dispersed in the solvent, which increases the number of micro-states and hence the entropy. Option A is correct.

To know more about the Entropy, here

https://brainly.com/question/23132859

#SPJ4

The gas occupies a volume of 1.28 L in its final state, which is option (c).

We can solve this problem using the combined gas law:

(P1V1/T1) = (P2V2/T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.

Plugging in the given values, we have:

(3.0 atm)(2.0 L)/(300 K) = (5.0 atm)(V2)/(320 K)

Solving for V2, we get:

V2 = (3.0 atm)(2.0 L)(320 K)/(5.0 atm)(300 K) = 1.28 L

Therefore, the gas occupies a volume of 1.28 L in its final state, which is option (c).

To know more about combined gas law refer to-

https://brainly.com/question/30458409

#SPJ11

To produce exactly 3.50 g of NaCl, we need 5.00 g of NaHCO3 and 2.18 g of HCl.

To find how much of the reactant is needed we need to use stoichiometry for finding the solution.

The balanced equation is : [tex]NaHCO_3 + HCl \rightarrow NaCl + CO_2 + H_2O[/tex]

We need to produce exactly 3.50 g NaCl. Now from the balanced equation, we can see that the molar ratio of [tex]NaHCO_3[/tex] to NaCl is 1:1. Therefore, we can  use the molar mass of NaCl to find the moles of NaCl that correspond to 3.50 g:

molar mass of NaCl = 58.44 g/mol

moles of NaCl = 3.5 / 58.44 = 0.0598 mol NaCl

As the molar ratio of [tex]NaHCO_3[/tex] to NaCl is 1:1, therefore we need 0.0598 mol of [tex]NaHCO_3[/tex]. Similarly, the molar ratio of HCl to [tex]NaHCO_3[/tex] is 1:1. Therefore, we need 0.0598 mol of HCl.

Now we can use the molar mass of each element to find the mass of each reactant required.

molar mass of [tex]NaHCO_3[/tex] = 84.01 g/mol

mass of [tex]NaHCO_3[/tex] = 0.0598 mol × 84.01 g/mol = 5.00 g

molar mass of HCl = 36.46 g/mol

mass of HCl = 0.0598 mol × 36.46 g/mol = 2.18 g

Therefore, to produce exactly 3.50 g of NaCl, we need 5.00 g of [tex]NaHCO_3[/tex] and 2.18 g of HCl.

Learn more about stoichiometry at:

https://brainly.com/question/30820349

#SPJ1

Answer and explanation:

Based on the temperature change, we can conclude that the reaction of baking soda and vinegar is exothermic. In an exothermic reaction, energy is released from the system to the surroundings in the form of heat, which causes an increase in the temperature of the surroundings.

In this case, the system consists of the baking soda and vinegar, which react to form carbon dioxide gas, water, and sodium acetate. As the reaction proceeds, energy is released from the system to the surroundings in the form of heat. This heat causes an increase in the temperature of the surroundings, which in this case is the surrounding air and any objects in the vicinity of the reaction.

The decrease in temperature from 25˚C to 19˚C indicates that the reaction released energy to the surroundings, and this energy was absorbed by the air and objects in the vicinity of the reaction. This is why the temperature of the surroundings decreases.

Overall, an exothermic reaction like this involves the conversion of potential energy stored in the reactants into kinetic energy in the form of heat, which is released to the surroundings.

If the unknown solution reacts with potassium carbonate to form a white precipitate, then it contains strontium ions, indicating that the unknown solution is strontium nitrate.

On the other hand, if the unknown solution reacts with potassium sulfate to form a white precipitate, then it contains magnesium ions, indicating that the unknown solution is magnesium nitrate.

Therefore, based on the observations, if a white precipitate is observed when the unknown solution is mixed with potassium carbonate and no precipitate is observed when the unknown solution is mixed with potassium sulfate, the unknown solution is most likely strontium nitrate.

If no precipitate is observed when the unknown solution is mixed with both potassium carbonate and potassium sulfate, the unknown solution is most likely magnesium nitrate.

Therefore, we can determine the identity of the unknown solution by observing the reaction with potassium carbonate and potassium sulfate.

For more question on carbonate

https://brainly.com/question/30594488

#SPJ11

The pH after the addition of 19.0 ml of 0.500 M HNO₃ to a 75.0 ml volume of 0.200 M NH₃ (Kb = 1.8 * 10⁻⁵) is 9.11.

1. Calculate moles of NH₃ and HNO₃: moles NH₃ = 75.0 ml * 0.200 mol/L = 15.0 mmol, moles HNO₃ = 19.0 ml * 0.500 mol/L = 9.5 mmol

2. Find moles of NH₃ remaining: 15.0 mmol - 9.5 mmol = 5.5 mmol

3. Calculate new concentrations: [NH₃] = 5.5 mmol / (75.0 ml + 19.0 ml) = 0.055 mol/L, [NH₄⁺] = 9.5 mmol / (75.0 ml + 19.0 ml) = 0.095 mol/L

4. Apply the Henderson-Hasselbalch equation: pH = pKa + log([NH₃]/[NH₄⁺])

5. Find pKa from Kb: pKa = 14 - log(Kb) = 14 - log(1.8 * 10⁻⁵) = 9.74

6. Calculate pH: pH = 9.74 + log(0.055/0.095) = 9.11

To know more about Henderson-Hasselbalch equation click on below link:

https://brainly.com/question/13423434#

#SPJ11

This type of reaction is classified as an endothermic reaction, as it absorbs energy in the form of heat from its surroundings.

The heat transfers between the cold pack and your skin by conduction, which is the transfer of heat energy from a warmer object to a cooler one. The law of conservation of energy states that energy cannot be created or destroyed, only transferred from one form to another.

In this case, the heat from your skin is transferred to the cold pack, and the cold pack absorbs the heat and converts it into a different form of energy, usually in the form of radiation or vibration.

This is the same process that occurs with an ice pack, where the heat in the skin is absorbed by the ice, and the ice radiates the heat away in the form of cold air.

Know more about Endothermic reaction here

https://brainly.com/question/23184814#

#SPJ11

The mass of the silver sample is approximately 77.9 grams.

To solve this problem, we can utilize the equation for heat transfer:

q = m * c * ΔT

where q represents the heat transferred, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

Initially, we calculate the heat transferred from the silver to the water:

q silver = m silver * c silver * ΔT silver

q water = m water * c water * ΔT water

For thermal equilibrium between the silver and water, we equate the two equations as they reach the same temperature:

q silver = q water

m silver * c silver * ΔT silver = m water * c water * ΔT water

Rearranging the equation allows us to solve for the mass of the silver:

m silver = (m water * c water * ΔT water) / (c silver * ΔT silver)

Substituting the given values:

m silver = (250g * 4.184 J/g°C * (23.35°C - 6.5°C)) / (0.235 J/g°C * (98.75°C - 23.35°C))

As a result:

m silver = 77.9 g

Thus, the mass of the silver sample is approximately 77.9 grams.

Know more about Calorimeter here:

https://brainly.com/question/4802333

#SPJ11

The standard enthalpy of formation of H₂O(l) is -63.2 kJ/mol.

To find the standard enthalpy of formation of H₂O(l) using the given information, follow these steps:

1. Write down the given standard enthalpy change for the reaction: -572.6 kJ.
2. Recall the equation for the standard enthalpy change of a reaction: ΔH° = Σ [n × ΔHf°(products)] - Σ [n × ΔHf°(reactants)], where n is the stoichiometric coefficient, and ΔHf° is the standard enthalpy of formation.
3. Apply the equation to the given reaction: -572.6 kJ = [ΔHf°(CO2) + ΔHf°(H₂O)] - [ΔHf°(H₂CO) + ΔHf°(O)].
4. Note that the standard enthalpy of formation for O₂(g) is zero since it is an elemental form.
5. Plug in the known values for the standard enthalpies of formation for CO₂(g) and H₂CO(g). The values are -393.5 kJ/mol for CO₂(g) and -115.9 kJ/mol for H₂CO(g).
6. Substitute the values into the equation: -572.6 kJ = [-393.5 kJ/mol + ΔHf°(H₂O)] - [-115.9 kJ/mol + 0].
7. Simplify and solve for ΔHf°(H₂O): ΔHf°(H₂O) = -572.6 kJ + 115.9 kJ + 393.5 kJ = -63.2 kJ/mol.

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H₂O(l) is -63.2 kJ/mol.

To know more about standard enthalpy  :

https://brainly.com/question/28303513

#SPJ11

CH₃COOC₅H₁₁ is the chemical formula for an ester. The structure of CH₃COOC₅H₁₁ is attached.

Esters are organic compounds that are formed from a reaction between a carboxylic acid and an alcohol. The ester formed from the reaction between acetic acid (CH₃COOH) and pentanol (C₅H₁₁OH) is CH₃COOC₅H₁₁.

The ester has a carbonyl group, which is a carbon atom double-bonded to an oxygen atom, that is located in the middle of the molecule. The carbonyl group is attached to an acetyl group (CH₃CO), which is a combination of a methyl group (CH₃) and a carbonyl group. The other end of the molecule is attached to a pentyl group (C₅H₁₁), which is a chain of five carbon atoms with eleven hydrogen atoms attached.

Esters are commonly used as fragrances and flavorings, and can be found in a variety of fruits and flowers. They also have many industrial applications, such as in the production of plastics, resins, and solvents.

To know more about ester here

https://brainly.com/question/31827356

#SPJ1

The reaction is a double displacement reaction, in which two ions switch places in the reactants to form the products. The chemical equation for the reaction between Na2CO3 (aq) and NaCl2 (aq) is as follows:

2 Na2CO3 (aq) + NaCl2 (aq) → 2 NaCl (aq) + CO2 (g) + H2O (l).

In this reaction, sodium carbonate (Na2CO3) reacts with sodium chloride (NaCl2) to form sodium chloride (NaCl), carbon dioxide (CO2) and water (H2O). The reaction is a double displacement reaction, in which two ions switch places in the reactants to form the products. The sodium ions in the Na2CO3 react with the chloride ions in the NaCl2 to form the NaCl, while the carbonate ions in the Na2CO3 react with the sodium ions in the NaCl2 to form CO2 and H2O.

The reaction does not form a precipitate, so no solid product is formed. This is because both the reactants and products are soluble in water, and so no solid product is formed.

Overall, this reaction between Na2CO3 and NaCl2 results in the formation of NaCl, CO2 and H2O, and no solid precipitate is formed. This is because both the reactants and products are soluble in water, and so no solid product is formed.

Know more about chemical equation here

https://brainly.com/question/28792948#

#SPJ11

Answer:

One of two or more versions of a genetic sequence at a particular region of a chromosome.

We need a volume of 60.4 ml of 11.7 M HCl to make a 500.0 ml solution with a pH of 3.20.

To calculate the required volume of 11.7 M HCl to make a 500.0 ml solution with a pH of 3.20, we need to use the Henderson-Hasselbalch equation, which relates the pH of a solution to its pKa and the ratio of the concentrations of the conjugate base and acid.

Using the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻] ÷ [HA])

where [A-] / [HA] is the ratio of the concentration of the conjugate base (Cl⁻) to the concentration of the acid (H⁺).

Rearranging the equation, we can solve for [H⁺]:

[H⁺] = [tex]10^{(pH - pKa)}[/tex]

[H⁺] = [tex]10^{(3.20 - (-1))}[/tex]

= [tex]10^{-3.20} + mol/L[/tex]

Since the concentration of HCl is equal to the concentration of [H⁺] in solution, we can calculate the moles of HCl required to make the solution:

moles of HCl = concentration of HCl × volume of solution

moles of HCl = [tex](10^{-3.20})[/tex] × (0.5 L)

= 7.08 × 10⁻⁴ mol

Finally, we can calculate the required volume of 11.7 M HCl:

volume of HCl = moles of HCl ÷ concentration of HCl

volume of HCl = (7.08 × 10⁻⁴ mol) ÷ (11.7 mol/L)

= 0.0604 L

= 60.4 ml

To learn more about solution follow the link:

brainly.com/question/1416865

#SPJ4

Answer:

388.88 mmHg (2 d.p.)

Explanation:

To find the final pressure when the volume is kept constant, we can use Gay-Lussac's law.

[tex]\boxed{\sf \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}}[/tex]

where:

The values to substitute into the equation are:

Substitute the values into the equation and solve for P₂:

[tex]\implies \sf \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]

[tex]\implies \sf \dfrac{745}{523 }=\dfrac{P_2}{273}[/tex]

[tex]\implies \sf P_2=\dfrac{745 \cdot 273}{523 }[/tex]

[tex]\implies \sf P_2=\dfrac{203385}{523 }[/tex]

[tex]\implies \sf P_2=388.88145315...[/tex]

[tex]\implies \sf P_2=388.88\;mmHg\;(2\;d.p.)[/tex]

Therefore, the final pressure would be 388.88 mmHg if a gas is cooled from 523 K to 273 K and the volume is kept constant, starting with an initial pressure of 745 mmHg.

Using the combined gas law, the temperature of a gas at 101.3 kPa is calculated to be 39.5°C, given its initial pressure and temperature of 801.3 kPa and 40.0°C, respectively.

To solve this problem, we can use the combined gas law which states that:

(P1V1/T1) = (P2V2/T2)

where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

We are given P1 = 801.3 kPa and T1 = 40.0°C, and we want to find T2 at P2 = 101.3 kPa.

Let's assume that the volume (V1) of the gas is constant. Therefore, we can write:

(P1/T1) = (P2/T2)

Solving for T2, we get:

T2 = (P2 x T1)/P1

Substituting the given values, we get:

T2 = (101.3 kPa x 313.15 K)/801.3 kPa

T2 = 39.5°C (rounded to one decimal place)

Therefore, the temperature of the gas at 101.3 kPa is 39.5°C.

To know more about the combined gas law refer here :

https://brainly.com/question/30458409#

#SPJ11  

Add approximately 10.9 grams of pentanol to 250 mL of water to make a 5% solution by volume.

To make a 5% solution by volume with pentanol and water, you'll need to determine the volume of pentanol to be added to the 250 mL of water.

First, find the total volume of the solution:

Total volume = (Volume of pentanol + 250 mL) * 100

Next, calculate the volume of pentanol needed for a 5% solution:

Volume of pentanol = (5% * Total volume) / 100

Since the desired solution is 5% pentanol by volume:

5% * (Volume of pentanol + 250 mL) = Volume of pentanol
0.05 * (Volume of pentanol + 250) = Volume of pentanol

Now, solve for the volume of pentanol:

0.05 * Volume of pentanol + 12.5 = Volume of pentanol
-0.05 * Volume of pentanol = -12.5
Volume of pentanol = 13.16 mL (rounded to 3 significant figures)

Now, use the density of pentanol to find the mass of pentanol to be added:

Mass of pentanol = Volume of pentanol * Density of pentanol
Mass of pentanol = 13.16 mL * 0.825 g/mL
Mass of pentanol ≈ 10.9 g (rounded to 3 significant figures)

Therefore, you should add approximately 10.9 grams of pentanol to 250 mL of water to make a 5% solution by volume.

To know more about Volume-Density Calculations:
https://brainly.com/question/1354972

#SPJ11

The equation Q = mcΔT, where Q is the amount of heat absorbed, m is the mass of the object, c is the specific heat capacity of the object, and ΔT is the change in temperature.

In this case, we are given the mass of the wood (1500.0 grams) and its specific heat capacity (1.8 g/JxC), as well as the amount of heat absorbed (67,500 Joules) and the final temperature (57C). We want to find the initial temperature.

First, we can rearrange the equation to solve for ΔT: ΔT = Q/mc. Plugging in the values we know, we get:
ΔT = 67,500 J / (1500.0 g x 1.8 g/JxC) = 25C

This tells us that the temperature of the wood increased by 25C due to the heat absorbed. To find the initial temperature, we can subtract ΔT from the final temperature:

Initial temperature = final temperature - ΔT = 57C - 25C = 32C
Therefore, the initial temperature of the wood was 32C.

In summary, we used the equation Q = mcΔT and rearranged it to solve for ΔT. We then subtracted ΔT from the final temperature to find the initial temperature of the wood. The specific heat capacity tells us how much heat energy is needed to raise the temperature of a given mass of a substance by a certain amount.

In this case, the specific heat capacity of the wood (1.8 g/JxC) was used to calculate how much heat energy was absorbed by the wood. The mass of the wood was also important, as it determines how much heat energy is needed to raise its temperature. The final temperature of the wood and the amount of heat absorbed were given in the problem, and we used this information to solve for the initial temperature.

To know more about specific heat capacity refer here

https://brainly.com/question/29766819#

#SPJ11

The student incorrectly calculated the mass of the sample of pyrite by assuming the density of pyrite to be 2 g/cm³, which is actually the density of water. The actual density of pyrite is about 5 g/cm³, so the actual mass of the 10 cm³ sample would be 50 g.

The student likely confused the concept of density, which is the mass per unit volume of a substance, with the specific gravity, which is the ratio of the density of a substance to the density of water.

Pyrite has a specific gravity of about 5, meaning that its density is about 5 times greater than that of water. Therefore, the mass of a 10 cm³ sample of pyrite would be 5 times greater than the mass of a 10 cm³ sample of water, or 50 g.

To learn more about Pyrite, here

https://brainly.com/question/13435246

#SPJ4

258.72 grams of CaBr2 is consumed when 96 g of Ca(OH)2 is produced in the given reaction.

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol).

CaBr2 + 2KOH → Ca(OH)2 + 2KBr

From the equation, we can see that 1 mole of CaBr2 reacts with 2 moles of KOH to produce 1 mole of Ca(OH)2 and 2 moles of KBr.

We need to first determine the number of moles of Ca(OH)2 produced from 96 g of Ca(OH)2. The molar mass of Ca(OH)2 is:

Ca(OH)2 = 1 x 40.08 (molar mass of Ca) + 2 x 16.00 (molar mass of O) + 2 x 1.01 (molar mass of H)

= 74.10 g/mol

Number of moles of Ca(OH)2 produced = Mass of Ca(OH)2 / Molar mass of Ca(OH)2

= 96 g / 74.10 g/mol

= 1.295 moles

From the balanced equation, we know that 1 mole of CaBr2 reacts with 1 mole of Ca(OH)2. Therefore, the number of moles of CaBr2 consumed in the reaction is also 1.295 moles.

Now, we can calculate the mass of CaBr2 consumed using its molar mass. The molar mass of CaBr2 is:

CaBr2 = 1 x 40.08 (molar mass of Ca) + 2 x 79.90 (molar mass of Br)

= 199.88 g/mol

Mass of CaBr2 consumed = Number of moles of CaBr2 consumed x Molar mass of CaBr2

= 1.295 moles x 199.88 g/mol

= 258.72 g

To know more about molar mass, click here

https://brainly.com/question/30216315

#SPJ1

The equilibrium concentration of Ag⁺ in the solution is 0.00200 M.

To solve this problem, we can use the equation for the reaction between silver nitrate (AgNO₃) and sodium iodate (NaIO₃), which is:

AgNO₃ + NaIO₃ -> AgIO₃ + NaNO₃

We know the initial concentrations of the two solutions: 0.00200 M for the AgNO₃ and 0.01 M for the NaIO₃. When they are mixed together, they will react to form a new equilibrium concentration of silver ions (Ag⁺).

To find the equilibrium concentration of Ag⁺, we need to use the stoichiometry of the reaction and the equilibrium constant (K) for the reaction. The balanced equation tells us that one mole of AgNO₃ reacts with one mole of NaIO₃ to form one mole of AgIO₃. Therefore, at equilibrium, the concentration of Ag⁺ will be equal to the initial concentration of AgNO₃ minus the amount that reacted to form AgIO₃:

[Ag⁺] = [AgNO₃] - [AgIO₃]

We can use the equilibrium constant expression for the reaction to find the concentration of AgIO₃:

K = [AgIO₃]/([AgNO₃][NaIO₃])

At equilibrium, this expression will equal the equilibrium constant for the reaction, which is given as 1.8 x 10^-12. We can rearrange this expression to solve for [AgIO₃]:

[AgIO₃] = K[AgNO₃][NaIO₃]

Substituting the initial concentrations and the value of K, we get:

[AgIO₃] = (1.8 x 10^-12)(0.00200 M)(0.01 M) = 3.6 x 10^-17 M

Now we can plug this value into the equation for [Ag⁺] to find the equilibrium concentration of silver ions:

[Ag⁺] = [AgNO₃] - [AgIO₃] = 0.00200 M - 3.6 x 10^-17 M = 0.00200 M (to three significant figures)

Learn more about equilibrium concentration at https://brainly.com/question/10838453

#SPJ11