The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
From the question given above, the following data were obtained :
Initial pressure (P₁) = 0.715 atmInitial temperature (T₁) = 200 °CFinal temperature (T₂) = 195 °CVolume = constantFinal pressure (P₂) = ?Now, Let's convert celsius temperature to Kelvin temperature ;
T(K) = T(°C) + 273
Initial temperature (T₁) = 200 °C = 200 °C + 273 = 473 KFinal temperature (T₂) = 195 °C = 195 °C + 273 = 462 KNow, we shall can determine the final pressure (P₂) ;
Initial pressure (P₁) = 0.715 atmInitial temperature (T₁) = 473 KFinal temperature (T₂) = 462 KFinal pressure (P₂) = ?P₁ / T₁ = P₂ / T₂
0.715 / 473 = P₂ / 462
473 × P₂ = 0.715 × 462
P₂ = 0.69 atm
Thus, the final pressure of the hot air balloon is 0.69 atm
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Help me pleaseeeeeeeee
Answer:
Make life easy for your customers and they are more likely to come back and buy again.
Explanation:
For example, you have to hire the right talent. You don't want somebody on the job that doesn't know how to do anything.
Chase went for a hike. He left at 8:00 A.M. At 10:00 A.M., he took a half-hour rest.
Chase returned home at 12:00 noon. While walking, Chase averaged 5 km/h. How
far did he hike?
Answer:
17.5 Km
Explanation:
T = 3.5 hours
v = 5 K/hr
S = VT
S = 5 × 3.5
S = 17.5 Km
Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Use the drop-
down menus to complete the statements.
The independent variable, the one that is intentionally manipulated, is
The dependent variable, the one that you measure the response in, is the pH of the solution
the physical properties
the system for measurement
Answer:
1) mass and type of material
2) type of material
3) temperature
Explanation:
Answer:
For Ed
Explanation:
The first one is: The physical proprieties.
The second one is: The pH of the solution.
I've been seeing the same answers from above around though, so I may be wrong. But either way, I tried.
Consider the following reaction.
2Fe2O3(s)+3C(s)−→−heat4Fe(s)+3CO2(g)
Calculate the number of grams of Fe2O3 needed to react with 18.3 g C.
Answer:
162 g Fe₂O₃
Explanation:
To find the mass of Fe₂O₃, you need to (1) convert grams C to moles C (via molar mass from periodic table), then (2) convert moles C to moles Fe₂O₃ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Fe₂O₃ to grams (via molar mass). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to reflect the given value.
Molar Mass (C): 12.011 g/mol
2 Fe₂O₃(s) + 3 C(s) ---> 4 Fe(s) + 3 CO₂(g)
Molar Mass (Fe₂O₃): 2(55.845 g/mol) + 3(15.998 g/mol)
Molar Mass (Fe₂O₃): 159.684 g/mol
18.3 g C 1 mole 2 moles Fe₂O₃ 159.684 g
-------------- x ---------------- x ------------------------- x ----------------- = 162 g Fe₂O₃
12.011 g 3 moles C 1 mole
A 10g of limestone is treated with dilute hydrochloric acid.The liberated gas measured at 27°C and 750mmHg is 18.5dm^3.Find the percentage purity of calcium carbonate.
Your question's data is not correct, it should be 100 grams of limestone instead of 10 grams, You will find the correct solution below according to that.
The percentage purity of calcium carbonate is 82.5%
The balanced chemical equation is
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
Because CO₂ is a gas, you can easily convert it to mole directly
No. of mol of CO₂ = volume dm³ /22.4 dm³
No. of mol of CO₂ = 8.5 dm³ / 22.4 dm³
No. of mol of CO₂ = 0.825 mol
According to equation 1 mole of CO2 is made from 1 mole of CaCO3
So, 0.825 mole of CO2 will be made from 0.825 mole of CaCO3
Mass of CaCO3 = moles of CaCO3 × Molar mass of CaCO3
Mass of CaCO3 = 0.825 × 100 grams
Mass of CaCO3 = 82.5 grams
Percentage purity of CaCO3 = (mass of CaCO3/Total mass of CaCO3) × 100
Percentage purity of CaCO3 = (82.5/100) × 100 %
Percentage purity of CaCO3 = 82.5 %
Thus we can say that as percentage purity is the percentage of mass of pure compound on per unit of total compound, the percentage purity of the calcium carbonate will be 82.5 %
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Balance the equation using the
correct coefficient
2Li + 2H2O____ 2LiaOH + 2H2
Answer:
2 Li + 2 H2O --> 2 LiaOH + 1 H2
What mass of carbon monoxide is required to react completely with 318g of iron(III) oxide?
The balanced equation for this reaction is [tex]3\text{CO}+\text{Fe}_{2}\text{O}_{3} \longrightarrow 2\text{Fe}+3\text{CO}_{2}[/tex].
This means that for every mole of iron(III) oxide consumed, 3 moles of carbon monoxide are consumed.
Iron has an atomic mass of 55.845 g/mol.Oxygen has an atomic mass of 15.999 g/mol.This means that iron(III) oxide has a formula mass of 2(55.845)+3(15.999)=g/mol, and thus 318 g is equal to [tex]\frac{318}{159.687}=1.9913956677751 \text{ mol}[/tex].
So, this means we need [tex]3(1.9913956677751)=5.9741870033253 \text{ mol}[/tex] of CO.
Carbon has an atomic mass of 12.011 g/mol.Oxygen has an atomic mass of 15.999 g/mol.This means CO has a formula mass of 12.011+15.999=28.01 g/mol, and thus 5.9741870033253 moles have a mass of (28.01)(5.9741870033253), which is equal to about 167 g (to 3 sf)
Calculate the volume in milliliters of 2.80 M potassium hydroxide that contains 14.5 g of solute
M = n/V
V = n/M
V = (14.5 : 56.1056)/2.8
V = 0.0923 L = 92.3 mL
What kind of reaction is symbolized by AB + CD → AD + CB?
O A. Decomposition
OB. Synthesis
O C. Double replacement
OD. Single replacement
C. Double replacement
cations and anions switch places
When the human body is exposed to extreme cold, hypothermia can result and the body’s temperature can drop to 28.68°C. Convert this temperature to K.
Answer:
299.83°K
Explanation:
So, kelvin is a means of measuring temperature, as the question implies. To convert Celsius, one form of measuring temperature, to Kelvin, another form of measuring temperature, we must know the conversion median. Our median is that 0°C = 273.15°K. So, now, as we know that 0°C = 273.15°K, 26.68°C = 273.15°K + 26.68°. Because 273.15K might as well be zero degrees celsius (according to our median 0°C = 273.15°K), we simply add 26.68° to 273.15K and get 299.83°K
explain hyaluronic acid
Answer:
Explanation:Hyaluronic acid is a natural substance found in the fluids in the eyes and joints. It acts as a cushion and lubricant in the joints and other tissues.
Different forms of hyaluronic acid are used for cosmetic purposes. Hyaluronic acid might also affect the way the body responds to injury and help to decrease swelling.
Hyaluronic acid injections are US FDA-approved for several conditions, including cataracts, osteoarthritis, and as an injectable gel filler (Juvedérm) for facial wrinkles. People also commonly take hyaluronic acid by mouth and apply it to the skin for UTIs, acid reflux, dry eyes, wound healing, aging skin, and many other conditions, but there is no good scientific evidence to support most of these other uses.
How does it work ?
Uses & Effectiveness ?
Likely Effective for
Cataracts. Injecting hyaluronic acid into the eye is effective when used during cataract surgery by an eye surgeon.
Swelling (inflammation) and sores inside the mouth (oral mucositis). Applying an FDA-approved hyaluronic acid gel is effective for treating mouth sores. It's not clear if other products help.
Answer:
Explanation:
Hyaluronic acid is a natural substance found in the fluids in the eyes and joints. It acts as a cushion and lubricant in the joints and other tissues. Different forms of hyaluronic acid are used for cosmetic purposes. Hyaluronic acid might also affect the way the body responds to injury and help to decrease swelling.
(❛◡❛✿)!
If 6.34 g of CuNO, is dissolved in water to make a 0.720 M solution, what is the volume of the solution in milliliters?
V=n/M
V=(6.34:125.55 g/mol)/0.72
V=0.07 L = 70 ml
Questions 1. Why does the colour change not occur instantly? Questions 1 . Why does the colour change not occur instantly ?in the reaction between carbon dioxide and water
Answer:
which is an example of analog device
Due to the reaction's slow process of producing ppt or a change in color.
What is chemical reaction?Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. Chemical reactions result in the formation of new chemical bonds between the atoms of the reactant molecules and the product particles' atoms. While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.
When carbon dioxide and water combine, carbonic acid is created. The indicator changes color as a result of the water becoming slightly acidic due to carbon dioxide gas from exhaled breath. Dissolution causes a change in pressure. This suggests a physical alteration.
Thus, due to the reaction's slow process of producing ppt or a change in color.
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The standard oxidation-reduction potential of a system Fe3+ —> Fe2+ is 0.77 V. What is the ratio of the oxidized form concentration to the reduced form concentration if E = 0.711 V?
Based on the oxidation-reduction potential of the system, ratio of the concentration of the oxidized form to the concentration of the reduced form is 1 : 10.
What is standard oxidation-reduction potential of a system?The oxidation-reduction potential of a system is a measure of the tendency for a given chemical species to be reduced.
The reduction equation is as follows:
[tex]Fe^{3+} \rightarrow Fe^{2+} = 0.77\:V[/tex]
Using the equation:
[tex]E = E^{o} - \frac{0.0592}{n}log\frac{[Fe^{2+}]}{[Fe^{3+}]}[/tex]
n = 1; E⁰ = 0.77; E = 0.711
Substituting the values and using 1/x as the ratio:
[tex]0.711 = 0.77 - \frac{0.0592}{1} * log\frac{1}{x}[/tex]
x = 1/10
Therefore, the ratio of the concentration of the oxidized form to the concentration of the reduced form is 1 : 10.
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The concentration of lead nitrate Pb(NO3)2
in a 0.726 M solution is __________ molal. The
density of the solution is 1.202 g/mL.
Answer: The concentration of lead nitrate Pb(NO3)2 in a 0.726 M solution is 0.755 molal.
Explanation:
Given:
The molar mass of Pb(NO3)2 is 331.2 g/mol
Assuming 1 litre of solution. This would equal 1202 g of solution
In the one litre of solution, you have 0.726 mol Pb(NO3)2
0.726 mol (331.2 g/mol) = 240.5 g Pb(NO3)2
Mass of water in 1 L of solution = 1202 g - 240.5 g = 961.5 g = 0.9615 kg
Molality = mols of solute / kg of solvent
= 0.726 mol / 0.9615 kg
= 0.755 m Pb(NO3)2
Glucose, C₂H12O6, is a product of photosynthesis.
It has the following structure.
HICIO
HICIOH
HOIC-H
HICIOH
HICIOH
HICIOH
I
H
How many chiral centres does the molecule have?
A 1
B2
C 4
D 6
Answer:
C
Explanation:
four chiral centers
The student ran out of time and did not do the second heating. Explain how this error would affect the calculation for the number of moles
The error caused will lower the number of moles when he did not do the second heating.This question is related to the empirical formula.
What is Empirical formula ?A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
The empirical formula is the simplest ratio of atoms in a given compound.
we know that heating is used to eliminate most of the water molecules which are attached to the compound in the question, it's given that the second heating was not performed by the students.
This means that there are still some water molecules attached to the compound. This will imply that higher mass will be calculated for the compound because the water molecules are also considered.
So now, if we look at the calculation for the number of moles of water in this, we can say that this will be lower than the actual amount.
This is because there are some unaccounted moles of water which are still attached to the compound and these will be accounted in the compound mass rather than the waters. Therefore, the number of moles will be lower.
Hence, The error caused will lower the number of moles when he did not do the second heating.
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describe how molecular motion and distance between molecules change as ice is heated to become a liquid and the gas
The conversion of heat to kinetic energy inside the water molecules causes the motion of the molecules to increase. The distance between molecules widens when the molecules move more quickly and clash more frequently. (As more heat is absorbed, the distance between molecules for solids, liquids, and gases widens)
If heat is added to 25.0g of copper, calcium, aluminum, iron, lead what will have the highest final temperature
Lead will have the highest temperature .
What is Specific Heat ?
Specific Heat is defined as the amount of heat required to raise the temperature of a 1 gm of substance by 1 degree Celsius.
If heat is added to 25.0g of copper, calcium, aluminum, iron, lead
The missing given specific heat is
Copper, 0.377
Calcium, 0.656
Aluminum, 0.895
Iron, 0.448
Lead, 0.129
Higher specific heat means more temperature required to bring the same amount of change in temperature
Here the temperature change is fixed , The metal with the lowest Specific heat will have the highest temperature.
From the data it can be seen that
Specific Heat of Lead, 0.129
Therefore Lead will have the highest temperature.
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How many stereoisomers could exist for the following structure?
4
8
16
32
Answer:
64
Explanation:
ieijkjkjjsjsjsjsjsjskskakskskskskkkdksksjdjdjdjdjdjdjdjdndndndmdndndmdmdndndndjdjdjdjdjdkdkekrk
When 50.0 g of calcium carbonate are reacted with sufficient hydrochloric acid, how many grams of calcium chloride will be produced
Answer:
55.5g of calcium chloride is produced in the reaction.
Explanation:
To calculate the amount of calcium chloride.
The reaction of calcium carbonate with hydrochloride acid gives calcium chloride
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
Mass of calcium carbonate (CaCO₃)= 50.0g
Molecular mass of CaCO₃ = Ca + C + O₃
= 40+ 12 + 3(16) = 100g
No of moles of calcium carbonate CaCO₃ = given mass / molecular mass
= 50g/ 100
= 0.5 moles
Molecular mass of calcium chloride = 40+ 2(35.5)=(40+71.0)= 111g/mol
1 mole of calcium carbonate gives = 1 mole of calcium chloride
0.5 moles of calcium carbonate gives= 0.5 × 111g/mole
= 55.5g
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How many possible electrons can be held in the Bohr model n=8 energy level?
Electrons in the Bohr model follow the number of elements in the rows of the periodic table.
2 in the first orbit
8 in the second and third ring
18 in the fourth etc...
The Bohr model is a simplistic means of explaining the placement of the subatomic particles of the elements of the periodic table.
The Bohr model arrangement of electrons follows the same pattern as the periodic table.
2 elements in the first row, and 2 electrons in the first orbit.
8 elements in the second row, and 8 electrons in the second orbit.
8 elements in the third row, and 8 electrons in the third orbit.
The fourth and fifth orbits would therefore hold 18 electrons.
For most chemists, the Bohr model does not work well beyond the third row of the periodic table because the model becomes quite oversized and bulky.
what item is made from a synthetic material
Synthetic materials are made from natural resources and can be used for many purposes.
What is synthetic material ?Synthetic materials are made by chemically changing the starting substances to create a material with different characteristics. Some examples of synthetic materials are plastics, medicines, and new fuels.
A synthetic substance may be chemically identical to a naturally-occurring substance or may be different.
Item is made from a synthetic material :
Plastic bagPlastic bottleDisposable diaperSynthetic fiber/cloth (polyester, nylon, or rayon)KevlarArtificial sweetenerSynthetic fuel (Synfuel)Synthetic rubberChloroquine (Malaria drug)Taxol(Cancer drug)Physostigmine (Glaucoma drug)Aspirin
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What is the mass (in ng) of 1.23 moles of nickel?
Answer:
7.22 x 10¹⁰ ng Ni
Explanation:
To find the mass of nickel, you need to (1) convert moles to grams (via atomic mass from the periodic table) and then (2) convert grams to nanograms. These ratios need to be multiplied by each other, starting with the given value. It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the given value (1.23).
Atomic Mass (Ni): 58.693 g/mol
1 gram = 1 x 10⁹ nanograms
1.23 moles Ni 58.693 g 1 x 10⁹ ng
---------------------- x ---------------------- x --------------------- = 7.22 x 10¹⁰ ng Ni
1 mole 1 g
324.55 cm - (6104.5 cm²/22.3 cm)
Answer: 50.806 cm is the correct answer.
Explanation: First divide 6104.5 cm^2 by 22.3 cm.
[tex]\frac{6104.5cm^2}{22.3cm} = 273.74 cm[/tex]
*Note: When dividing units, subtract the exponents, and when multiplying units simply add the exponents.
Then continue by subtracting 324.55 cm - 273.74 cm.
This should give you an answer of 50.806 cm.
PLEASE NO FAKE ANSWERS!! Chemistry!!! Please will give brainliest !! Show work
When 1 mole of Zn and 2 mole of O₂ reacts togethor, It will produce 1 mole of ZnO as O₂ is excess reagent and Zn will act as Limiting reagent and thus it limits the amount of product formed.
What is Limiting reagent ?Limiting reagents are the substances that are completely consumed first in a chemical reaction.
Given ;
Amopunt of Zn : 1 moleAmount of O₂ : 2 moleGiven equation ;
2Zn + O₂ --> 2ZnO
As according to given chemical equation,
2 moles Zn of reacts with 1 mole of O₂ to produce 2 moles of ZnO.
Therefore,
1 mole of Zn will require 0.5 mole of O₂.
But,
the given amount of O₂ is 2 mole which is excess
Hence,
Zn here will act as the Limiting reagent, According to which the amount of product formed will be decided.
Therefore,
If 2 mole Zn produces : 2 moles of ZnO (According to given balanced equation)
Thus,
1 mole of Zn will produce = 2/2 x 1
= 1 mole of ZnO
Hence, When 1 mole of Zn and 2 mole of O₂ reacts togethor, It will produce 1 mole of ZnO as O₂ is excess reagent and Zn will act as Limiting reagent and thus it limits the amount of product formed.
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C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
Carbon dioxide + Water Glucose (sugar) + Oxygen CO2 + H2O C6H12O6 + 6O2 Cellular respiration or aerobic respiration is a series of chemical reactions which begin with the reactants of sugar in the presence of oxygen to produce carbon dioxide and water as waste products.
Which of the following is a heterogeneous mixture?
a) milk
b) air
c) oil and vinegar
d) vinegar in water
Answer:
c) oil and vinegar
Explanation:
A heterogeneous mixture is a mixture that does not have a "uniform composition" (meaning that the entire mixture is not thoroughly mixed to be the exact same. In different parts of the mixture, there is a non-consistent / differing composition.)
Oil and vinegar, as you may know, do not thoroughly mix when put together--different parts of the mixture are made of different compositions. Some parts are made of oil, and some are a concentration of vinegar, but because they are not able to be mixed entirely, the mixture is considered a heterogeneous mixture. If you were to take different samples of different parts of the liquid, you would have a clear separation of oil and vinegar.
Milk is thoroughly milk--if you take out a tablespoon, it will be milk entirely--and it will have the same composition as all of the other milk in the bottle.
Air is complicated--and it can be described as either, but the question was likely intending the answer of oil and vinegar.
Vinegar and water do thoroughly mix. Vinegar absorbs water on a molecular level, so the mixture is thoroughly mixed when put together.
(Hope this helps!)
You are given the following information: mass = 48 g; volume=24 cm. What is the density of this substance?
Answer:
Density = 0.0035 g/cm³
Explanation:
The density equation looks like this:
Density (g/cm³) = mass (g) / volume (cm³)
You have been given both the mass and volume. However, the given volume is not in the correct units. To convert cm to cm³, you should simply raise the given volume to the power of 3.
24 cm = (24 cm)³ = 24³cm³ = 13,834 cm³
Now, you can plug you mass and volume into the equation and solve for density. The final answer should have 2 sig figs to reflect the given values.
Density = mass / volume
Density = 48 g / 13,824 cm³
Density = 0.00347 g/cm³
Density = 0.0035 g/cm³
Number of molecules in .99 mol C6H5NO2
Answer:
5.96 * 10^23 molecules
Explanation:
Don't start counting up the number of CsHsNs and Os there are Counting up the atom ions will get a wrong answer. The question is asking for the number of molecules. That means you do not break down each molecule to find the number of molecules. You modify 1 mol to find out how many molecules are in 0.99 mols. Do that using a proportion.
1 mol contains 6.01 * 10^23 molecules
0.99 mol contains x
1/0.99 = 6.02 * 10^23 / x molecules
x = 0.99 * 6.02 * 10^23
x = 5.96 * 10^23
