Question 1

A 500-mL sample of argon at 800 torr has its absolute temperature quadrupled.If the volume remains unchanged,what is the new pressure?

Accepted Answer

A)  200 torr
B)  400 torr
C)  800 torr
D)  2400 torr
E)  3200 torrF) A) and B)
G) B) and D)

Question 2

For a pure gas sample,the average kinetic energy is also the most probable kinetic energy.

Accepted Answer

A) True 
 B)False

Question 3

At what temperature in Kelvin is the root mean square speed of helium atoms (atomic weight = 4.00) equal to that of oxygen molecules (molecular weight = 32.00) at 300.K?

Accepted Answer

A)  37.5 K
B)  75 K
C)  106 K
D)  292 K
E)  2400.KF) B) and C)
G) A) and B)

Question 4

The pressure of sulfur dioxide in a container is 159 kPa.What is this pressure in atmospheres?

Accepted Answer

A)  0.209 atm
B)  0.637 atm
C)  1.57 atm
D)  21.2 atm
E)  15,900 atmF) A) and B)
G) A) and C)

Question 5

"The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ Law.

Accepted Answer

A)  Charles'
B)  Boyle's
C)  Amontons'
D)  Avogadro's
E)  Dalton'sF) B) and C)
G) A) and E)

Question 6

The pressure of hydrogen sulfide gas in a container is 35,650 Pa.What is this pressure in torr?

Accepted Answer

A)  46.91 torr
B)  267.4 torr
C)  351.8 torr
D)  3612 torr
E)  27,090 torrF) A) and E)
G) A) and C)

Question 7

For a gas obeying Boyle's Law,a plot of V versus 1/P will give a straight line passing through the origin.

Accepted Answer

A) True 
 B)False

Question 8

What is the pressure in a 7.50-L flask if 0.15 mol of carbon dioxide is added to 0.33 mol of oxygen? The temperature of the mixture is 48.0°C.

Accepted Answer

A)  0.252 atm
B)  0.592 atm
C)  1.69 atm
D)  3.96 atm
E)  4.80 atmF) C) and D)
G) C) and E)

Question 9

Arrange the following gases in order of increasing rate of effusion.
3 < C2H6 B) C2H6 < PH3 < HCl < Ar C) Ar < PH3 < C2H6 < HCl D) C2H6 < HCl < PH3 < Ar E) Ar <PH3 < HCl < C2H6" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Ar < HCl <PH3 < C2H6
B)  C2H6 < PH3 < HCl < Ar
C)  Ar < PH3 < C2H6 < HCl
D)  C2H6 < HCl < PH3 < Ar
E)  Ar <PH3 < HCl < C2H6F) A) and E)
G) B) and D) A

Question 10

Hydrogen gas exerts a pressure of 466 torr in a container.What is this pressure in atmospheres?

Accepted Answer

A)  0.217 atm
B)  0.466 atm
C)  0.613 atm
D)  1.63 atm
E)  4.60 atmF) C) and E)
G) A) and E) C

Question 11

Use the van der Waals equation for real gases to calculate the pressure exerted by 1.00 mole of ammonia at 27°C in a 750-mL container.(a = 4.17 L2·atm/mol2,b = 0.0371 L/mol)

Accepted Answer

A)  23.2 atm
B)  27.1 atm
C)  32.8 atm
D)  42.0 atm
E)  32.8 torrF) A) and B)
G) A) and C)

Question 12

A sample of propane,a component of LP gas,has a volume of 35.3 L at 315 K and 922 torr.What is its volume at STP?

Accepted Answer

A)  25.2 L
B)  30.6 L
C)  33.6 L
D)  37.1 L
E)  49.2 LF) B) and D)
G) B) and E) D

Question 13

A compound composed of carbon,hydrogen,and chlorine effuses through a pinhole 0.411 times as fast as neon.Select the correct molecular formula for the compound.

Accepted Answer

A)  CHCl3
B)  CH2Cl2
C)  C2H2Cl2
D)  C2H3Cl
E)  CCl4F) B) and D)
G) B) and C)

Question 14

"The volume of an ideal gas is directly proportional to the number of moles of the gas at constant temperature and pressure" is a statement of _____________ Law.

Accepted Answer

A)  Charles'
B)  Boyle's
C)  Amontons'
D)  Avogadro's
E)  Dalton'sF) All of the above
G) A) and D)

Question 15

The rate of diffusion of a gas is inversely proportional to its molar mass.

Accepted Answer

A) True 
 B)False

Question 16

A gas mixture,with a total pressure of 300.torr,consists of equal masses of Ne (atomic weight 20. ) and Ar (atomic weight 40. ) .What is the partial pressure of Ar,in torr?

Accepted Answer

A)  75 torr
B)  100.torr
C)  150.torr
D)  200.torr
E)  None of these choices is correct.F) A) and B)
G) C) and D)

Question 17

A 3.60-L gas sample is at a pressure of 95.5 kPa and a temperature of 25.0°C.
a.Calculate the volume occupied by the gas at STP,assuming it behaves ideally.
b.If the gas sample weighs 6.10 g,calculate the molar mass of the gas.

Accepted Answer

a.3.11 L
b...

Question 18

A 3.0-L sample of helium was placed in a container fitted with a porous membrane.Half of the helium effused through the membrane in 24 hours.A 3.0-L sample of oxygen was placed in an identical container.How many hours will it take for half of the oxygen to effuse through the membrane?

Accepted Answer

A)  8.5 h
B)  12 h
C)  48 h
D)  60.h
E)  68 hF) C) and D)
G) A) and B)

Question 19

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its pressure,other factors remaining constant?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and D)
G) A) and C)

Question 20

A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37.0°C.How many moles of nitrogen are in the container?

Accepted Answer

A)  0.271 mol
B)  2.27 mol
C)  3.69 mol
D)  206 mol
E)  227 molF) B) and E)
G) C) and E)

Exam 5: Gases and the Kinetic-Molecular Theory

A 500-mL sample of argon at 800 torr has its absolute temperature quadrupled.If the volume remains unchanged,what is the new pressure?

Correct AnswerverifiedShow Answer

For a pure gas sample,the average kinetic energy is also the most probable kinetic energy.

Correct AnswerverifiedShow Answer

At what temperature in Kelvin is the root mean square speed of helium atoms (atomic weight = 4.00) equal to that of oxygen molecules (molecular weight = 32.00) at 300.K?

Correct AnswerverifiedShow Answer

The pressure of sulfur dioxide in a container is 159 kPa.What is this pressure in atmospheres?

Correct AnswerverifiedShow Answer

"The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ Law.

Correct AnswerverifiedShow Answer

The pressure of hydrogen sulfide gas in a container is 35,650 Pa.What is this pressure in torr?

Correct AnswerverifiedShow Answer

For a gas obeying Boyle's Law,a plot of V versus 1/P will give a straight line passing through the origin.

Correct AnswerverifiedShow Answer

What is the pressure in a 7.50-L flask if 0.15 mol of carbon dioxide is added to 0.33 mol of oxygen? The temperature of the mixture is 48.0°C.

Correct AnswerverifiedShow Answer

Arrange the following gases in order of increasing rate of effusion.

Correct AnswerverifiedA

Hydrogen gas exerts a pressure of 466 torr in a container.What is this pressure in atmospheres?

Correct AnswerverifiedC

Use the van der Waals equation for real gases to calculate the pressure exerted by 1.00 mole of ammonia at 27°C in a 750-mL container.(a = 4.17 L2·atm/mol2,b = 0.0371 L/mol)

Correct AnswerverifiedShow Answer

A sample of propane,a component of LP gas,has a volume of 35.3 L at 315 K and 922 torr.What is its volume at STP?

Correct AnswerverifiedD

A compound composed of carbon,hydrogen,and chlorine effuses through a pinhole 0.411 times as fast as neon.Select the correct molecular formula for the compound.

Correct AnswerverifiedShow Answer

"The volume of an ideal gas is directly proportional to the number of moles of the gas at constant temperature and pressure" is a statement of _____________ Law.

Correct AnswerverifiedShow Answer

The rate of diffusion of a gas is inversely proportional to its molar mass.

Correct AnswerverifiedShow Answer

A gas mixture,with a total pressure of 300.torr,consists of equal masses of Ne (atomic weight 20. ) and Ar (atomic weight 40. ) .What is the partial pressure of Ar,in torr?

Correct AnswerverifiedShow Answer

A 3.60-L gas sample is at a pressure of 95.5 kPa and a temperature of 25.0°C. a.Calculate the volume occupied by the gas at STP,assuming it behaves ideally. b.If the gas sample weighs 6.10 g,calculate the molar mass of the gas.

Correct Answerverifieda.3.11 Lb...View AnswerShow Answer

A 3.0-L sample of helium was placed in a container fitted with a porous membrane.Half of the helium effused through the membrane in 24 hours.A 3.0-L sample of oxygen was placed in an identical container.How many hours will it take for half of the oxygen to effuse through the membrane?

Correct AnswerverifiedShow Answer

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its pressure,other factors remaining constant?

Correct AnswerverifiedShow Answer

A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37.0°C.How many moles of nitrogen are in the container?

Correct AnswerverifiedShow Answer

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C

Use the van der Waals equation for real gases to calculate the pressure exerted by 1.00 mole of ammonia at 27°C in a 750-mL container.(a = 4.17 L²·atm/mol²,b = 0.0371 L/mol)

Correct Answer
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D

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a.3.11 L
b...
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