Question 1

With respect to the Maxwell-Boltzmann probability distribution function of molecular speeds, which of the following is true?

Accepted Answer

A)   
B)   A and D
C)   
D)   
E)

Question 2

The diffusion rate of H2 gas is 6.45 times as great as that of a certain noble gas (both gases are at the same temperature) . What is the noble gas?

Accepted Answer

A)   He
B)   Ar
C)   Kr
D)   Ne
E)   Xe

Question 3

Calculate the density of nitrogen at STP.

Accepted Answer

A)   1.25 g/L
B)   0.625 g/L
C)   0.312 g/L
D)   1.60 g/L
E)   0.800 g/L

Question 4

Mercury vapor contains Hg atoms. What is the volume of 200. g of mercury vapor at a temperature of 822 K and 0.500 atm?

Accepted Answer

A)   135 L
B)   329 L
C)   82.2 L
D)   67.2 L
E)   none of these

Question 5

Gas A (MM = 36.0 g/mol) and gas B (MM = 62 g/mol) are present in a mixture that contains 50 molecules A : 326 molecules B. If these gases effuse through a pinhole into a neighboring evacuated chamber, what will be the ratio of A:B in the chamber?

Accepted Answer

The answer of Gas A (MM = 36.0 g/mol) and...

Question 6

Consider the following gas samples:
​ 
​
Which one of the following statements is false?

Accepted Answer

A)   Assuming identical intermolecular forces in the two samples, sample A should be more nearly ideal than sample B.
B)   The root-mean-square velocity of molecules in sample A is twice as large as the root-mean-square velocity of molecules in sample B.
C)   The average kinetic energy of the molecules in sample A is twice the average kinetic energy of the molecules in sample B.
D)   The fraction of molecules in sample A having a kinetic energies greater than some high fixed value is larger than the fraction of molecules in sample B having kinetic energies greater than that same high fixed value.
E)   The volume of sample A is twice the volume of sample B.

Question 7

When a mixture is prepared from 15.0 L of ammonia and 15.0 L of chlorine measured at the same conditions, these compounds react according to the following equation:
2NH3(g)  + 3Cl2(g)  → N2(g)  + 6HCl(g) 
When the reaction is completed, what are the volumes of the gases (NH3, Cl2, N2, and HCl, respectively) ? Assume the final volumes are measured under identical conditions.

Accepted Answer

A)   0.00 L, 0.00 L, 5.00 L, and 30.0 L
B)   0.00 L, 0.00 L, 7.50 L, and 45.0 L
C)   0.00 L, 5.00 L, 7.50 L, and 45.0 L
D)   5.00 L, 0.00 L, 5.00 L, and 30.0 L
E)   0.00 L, 10.0 L, 15.0 L, and 90.0 L

Question 8

A 250.0-L cylinder contains 65.0% He(g)  and 35.0% Kr(g)  by mass at 25.0°C and 1.35 atm total pressure. What is the partial pressure of He in this container?

Accepted Answer

A)   0.675 atm
B)   0.878 atm
C)   1.32 atm
D)   1.35 atm
E)   0.473 atm

Question 9

Order the following according to increasing rate of effusion:
F2, Cl2, NO, NO2, CH4

Accepted Answer

A)   CH4  2  2 2
B)   Cl2  2  2  4  
C)   Cl2  2  2  4
D)   CH4  2 2  2
E)   F2  2 2 4

Question 10

Four identical 1.0-L flasks contain the gases He, Cl2, CH4, and NH3, each at 0°C and 1 atm pressure.
-For which gas are the collisions elastic?

Accepted Answer

A)   He
B)   Cl2
C)   CH4
D)   NH3
E)   The collisions are elastic for all the gases.

Question 11

The kinetic-molecular theory of gases does not assume that

Accepted Answer

A)   gas particles are very small compared to the average distance between the particles.
B)   gas particles collide with the walls of their container in elastic collisions.
C)   the average velocity of gas particles is directly proportional to the absolute temperature.
D)   gases are made up of tiny particles in constant chaotic motion.
E)   All of these are correct.

Question 12

Consider separate samples of Ar(g)  and Ne(g) . For what ratio of absolute temperatures (Ne:Ar)  are the average kinetic energies equal?

Accepted Answer

A)   1.41
B)   0.505
C)   1.98
D)   1.00
E)   none of these

Question 13

A sample of oxygen gas has a volume of 4.50 L at 27°C and 800.0 torr. How many oxygen molecules does it contain?

Accepted Answer

A)   1.16 × 1022
B)   1.16 × 1023
C)   2.32 × 1024
D)   5.8 × 1022
E)   none of these

Question 14

The volume of a helium balloon is 1.85 L at 24.0°C and 1.00 atm at sea level. The balloon is released and floats upward. At a certain altitude, the balloon has a volume of 2.14 L and the temperature is 15.2°C. What is the atmospheric pressure at this altitude?

Accepted Answer

A)   0.538 atm
B)   1.36 atm
C)   0.839 atm
D)   0.891 atm
E)   none of these

Question 15

Samples of the gases H2(g)  and SO2(g)  have equal masses and are at the same temperature and pressure. Calculate the following:
-The ratio of the root-mean-square velocities 2(g)  and SO2(g)  have equal masses and are at the same temperature and pressure. Calculate the following: -The ratio of the root-mean-square velocities   . A)  180 B)  32 C)  0.18 D)  1.0 E)  5.6" class="answers-bank-image d-inline" rel="preload" > .

Accepted Answer

A)   180
B)   32
C)   0.18
D)   1.0
E)   5.6

Question 16

How is the observed pressure of a gas related to the ideal pressure?

Accepted Answer

A)   The relationship depends on the gas.
B)   They are equal.
C)   The observed pressure is greater than the ideal pressure.
D)   The observed pressure is less than the ideal pressure.
E)   none of these

Question 17

A 1.00-g sample of a gaseous compound of boron and hydrogen occupies 0.820 L at 1.00 atm and 3°C. What is the molecular formula for the compound?

Accepted Answer

A)   B2H6
B)   B4H10
C)   B5H14
D)   B3H12
E)   BH3

Question 18

Consider three 1-L flasks at the same temperature and pressure. Flask A contains CO gas, flask B contains N2 gas, and flask C contains O2 gas.In which flask do the molecules have the greatest momentum per impact?

Accepted Answer

A)   The molecules in all the flasks have the same momentum per impact.
B)   flask C
C)   The molecules in two of the flasks have the same momentum per impact.
D)   flask A
E)   flask B

Question 19

Potassium chlorate decomposes upon heating as follows:
2KClO3(s)  → 2KCl(s)  + 3O2(g) 
A 2.72-g sample of KClO3 decomposes, and the oxygen at 23.4°C and 0.935 atm is collected. What volume of oxygen gas will be collected, assuming 100% yield?

Accepted Answer

A)   2.21 mL
B)   0.577 mL
C)   0.0456 mL
D)   0.0684 mL
E)   0.866 mL

Question 20

Given a cylinder of fixed volume filled with 1 mol of argon gas, which of the following is correct? (Assume all gases obey the ideal gas law.)

Accepted Answer

A)   If a second mole of argon is added to the cylinder, the ratio T/P will remain constant.
B)   If the temperature of the cylinder is changed from 25°C to 50°C, the pressure inside the cylinder will double.
C)   A cylinder of identical volume filled with the same pressure of helium must contain more atoms of gas because He has a smaller atomic radius than argon.
D)   Two of these are correct.
E)   None of these is correct.

Exam 5: Gases

Consider separate samples of Ar(g) and Ne(g) . For what ratio of absolute temperatures (Ne:Ar) are the average kinetic energies equal?

Correct Answer
verified

How is the observed pressure of a gas related to the ideal pressure?

Correct Answer
verified

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He, Cl₂, CH₄, and NH₃, each at 0°C and 1 atm pressure. -For which gas are the collisions elastic?

Correct Answer
verified

Potassium chlorate decomposes upon heating as follows: 2KClO₃(s) → 2KCl(s) + 3O₂(g) A 2.72-g sample of KClO₃ decomposes, and the oxygen at 23.4°C and 0.935 atm is collected. What volume of oxygen gas will be collected, assuming 100% yield?

Correct Answer
verified

Mercury vapor contains Hg atoms. What is the volume of 200. g of mercury vapor at a temperature of 822 K and 0.500 atm?

Correct Answer
verified

The volume of a helium balloon is 1.85 L at 24.0°C and 1.00 atm at sea level. The balloon is released and floats upward. At a certain altitude, the balloon has a volume of 2.14 L and the temperature is 15.2°C. What is the atmospheric pressure at this altitude?

Correct Answer
verified

The diffusion rate of H₂ gas is 6.45 times as great as that of a certain noble gas (both gases are at the same temperature) . What is the noble gas?

Correct Answer
verified

With respect to the Maxwell-Boltzmann probability distribution function of molecular speeds, which of the following is true?

Correct Answer
verified

The kinetic-molecular theory of gases does not assume that

Correct Answer
verified

Order the following according to increasing rate of effusion: F₂, Cl₂, NO, NO₂, CH₄

Correct Answer
verified

A 250.0-L cylinder contains 65.0% He(g) and 35.0% Kr(g) by mass at 25.0°C and 1.35 atm total pressure. What is the partial pressure of He in this container?

Correct Answer
verified

Calculate the density of nitrogen at STP.

Correct Answer
verified

Correct Answer
verified

Given a cylinder of fixed volume filled with 1 mol of argon gas, which of the following is correct? (Assume all gases obey the ideal gas law.)

Correct Answer
verified

A sample of oxygen gas has a volume of 4.50 L at 27°C and 800.0 torr. How many oxygen molecules does it contain?

Correct Answer
verified

Gas A (MM = 36.0 g/mol) and gas B (MM = 62 g/mol) are present in a mixture that contains 50 molecules A : 326 molecules B. If these gases effuse through a pinhole into a neighboring evacuated chamber, what will be the ratio of A:B in the chamber?

Correct Answer
verified

A 1.00-g sample of a gaseous compound of boron and hydrogen occupies 0.820 L at 1.00 atm and 3°C. What is the molecular formula for the compound?

Correct Answer
verified

Samples of the gases H₂(g) and SO₂(g) have equal masses and are at the same temperature and pressure. Calculate the following: -The ratio of the root-mean-square velocities .

Correct Answer
verified

Consider three 1-L flasks at the same temperature and pressure. Flask A contains CO gas, flask B contains N₂ gas, and flask C contains O₂ gas.In which flask do the molecules have the greatest momentum per impact?

Correct Answer
verified

Exam 5: Gases

Consider separate samples of Ar(g) and Ne(g) . For what ratio of absolute temperatures (Ne:Ar) are the average kinetic energies equal?

Correct AnswerverifiedShow Answer

How is the observed pressure of a gas related to the ideal pressure?

Correct AnswerverifiedShow Answer

Consider the following gas samples: ​ ​ Which one of the following statements is false?

Correct AnswerverifiedShow Answer

Four identical 1.0-L flasks contain the gases He, Cl2, CH4, and NH3, each at 0°C and 1 atm pressure. -For which gas are the collisions elastic?

Correct AnswerverifiedShow Answer

Potassium chlorate decomposes upon heating as follows: 2KClO3(s) → 2KCl(s) + 3O2(g) A 2.72-g sample of KClO3 decomposes, and the oxygen at 23.4°C and 0.935 atm is collected. What volume of oxygen gas will be collected, assuming 100% yield?

Correct AnswerverifiedShow Answer

Mercury vapor contains Hg atoms. What is the volume of 200. g of mercury vapor at a temperature of 822 K and 0.500 atm?

Correct AnswerverifiedShow Answer

The volume of a helium balloon is 1.85 L at 24.0°C and 1.00 atm at sea level. The balloon is released and floats upward. At a certain altitude, the balloon has a volume of 2.14 L and the temperature is 15.2°C. What is the atmospheric pressure at this altitude?

Correct AnswerverifiedShow Answer

The diffusion rate of H2 gas is 6.45 times as great as that of a certain noble gas (both gases are at the same temperature) . What is the noble gas?

Correct AnswerverifiedShow Answer

With respect to the Maxwell-Boltzmann probability distribution function of molecular speeds, which of the following is true?

Correct AnswerverifiedShow Answer

The kinetic-molecular theory of gases does not assume that

Correct AnswerverifiedShow Answer

Order the following according to increasing rate of effusion: F2, Cl2, NO, NO2, CH4

Correct AnswerverifiedShow Answer

A 250.0-L cylinder contains 65.0% He(g) and 35.0% Kr(g) by mass at 25.0°C and 1.35 atm total pressure. What is the partial pressure of He in this container?

Correct AnswerverifiedShow Answer

Calculate the density of nitrogen at STP.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Given a cylinder of fixed volume filled with 1 mol of argon gas, which of the following is correct? (Assume all gases obey the ideal gas law.)

Correct AnswerverifiedShow Answer

A sample of oxygen gas has a volume of 4.50 L at 27°C and 800.0 torr. How many oxygen molecules does it contain?

Correct AnswerverifiedShow Answer

Gas A (MM = 36.0 g/mol) and gas B (MM = 62 g/mol) are present in a mixture that contains 50 molecules A : 326 molecules B. If these gases effuse through a pinhole into a neighboring evacuated chamber, what will be the ratio of A:B in the chamber?

Correct AnswerverifiedShow Answer

A 1.00-g sample of a gaseous compound of boron and hydrogen occupies 0.820 L at 1.00 atm and 3°C. What is the molecular formula for the compound?

Correct AnswerverifiedShow Answer

Samples of the gases H2(g) and SO2(g) have equal masses and are at the same temperature and pressure. Calculate the following: -The ratio of the root-mean-square velocities .

Correct AnswerverifiedShow Answer

Consider three 1-L flasks at the same temperature and pressure. Flask A contains CO gas, flask B contains N2 gas, and flask C contains O2 gas.In which flask do the molecules have the greatest momentum per impact?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He, Cl₂, CH₄, and NH₃, each at 0°C and 1 atm pressure. -For which gas are the collisions elastic?

Correct Answer
verified

Potassium chlorate decomposes upon heating as follows: 2KClO₃(s) → 2KCl(s) + 3O₂(g) A 2.72-g sample of KClO₃ decomposes, and the oxygen at 23.4°C and 0.935 atm is collected. What volume of oxygen gas will be collected, assuming 100% yield?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The diffusion rate of H₂ gas is 6.45 times as great as that of a certain noble gas (both gases are at the same temperature) . What is the noble gas?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Order the following according to increasing rate of effusion: F₂, Cl₂, NO, NO₂, CH₄

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Samples of the gases H₂(g) and SO₂(g) have equal masses and are at the same temperature and pressure. Calculate the following: -The ratio of the root-mean-square velocities .

Correct Answer
verified

Consider three 1-L flasks at the same temperature and pressure. Flask A contains CO gas, flask B contains N₂ gas, and flask C contains O₂ gas.In which flask do the molecules have the greatest momentum per impact?

Correct Answer
verified