Question 1

A gas occupies 3.33 L at 2.23 bar. What is the volume at 2.50 bar?

Accepted Answer

A)   1.67 L
B)   3.73 L
C)   2.97 L
D)   0.268 L
E)   18.6 LF) A) and B)
G) None of the above C

Question 2

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s-1 at 381 K.

Accepted Answer

A)   131 g mol-1
B)   83.8 g mol-1
C)   39.9 g mol-1
D)   20.2 g mol-1
E)   4.00 g mol-1F) A) and B)
G) B) and E)

Question 3

Match the following.
-barometer

Accepted Answer

A)  PV = nRT
B)  V1/T1 = V2/T2
C)  V1/n1 = V2/n2
D)  PT = PA + PB + PC ...
E)  measures pressure of a gasF) measures atmospheric pressureG) measures blood pressureH) P1V1 = P2V2I) None of the above
J) D) and G) F

Question 4

A gas mixture consists of N2, O2, and Ne, where the mole fraction of N2 is 0.55 and the mole fraction of Ne is 0.25. If the mixture is at STP in a 5.0 L container, how many molecules of O2 are present?

Accepted Answer

A)   4.5 × 1022 molecules O2
B)   2.7 × 1022 molecules O2
C)   3.7 × 1023 molecules O2
D)   1.1 × 1023 molecules O2
E)   9.3 × 1024 molecules O2F) C) and D)
G) D) and E)

Question 5

Which of the following compounds will behave least like an ideal gas at low temperatures?

Accepted Answer

A)   He
B)   SO2
C)   H2
D)   N2
E)   F2F) A) and D)
G) All of the above

Question 6

Which of the following samples has the greatest density at STP?

Accepted Answer

A)   NO2
B)   Xe
C)   SO2
D)   SF6
E)   All of these samples have the same density at STP.F) A) and E)
G) A) and C) D

Question 7

If NO2 and NH3 are allowed to effuse through a porous membrane under identical conditions, the rate of effusion for NH3 will be ________ times that of NO2.

Accepted Answer

A)   0.37
B)   0.61
C)   1.6
D)   2.7E) C) and D)
F) B) and C)

Question 8

What volume (in mL)  will a sample of F2 gas occupy in a syringe at 5.57 bar if the F2 has a volume of 25.0 mL at 1.22 bar?

Accepted Answer

A)   11 mL
B)   17 mL
C)   3.8 mL
D)   5.5 mL
E)   7.6 mLF) A) and B)
G) C) and E)

Question 9

What volume will 4.91 × 1022 atoms of Ne occupy at STP?

Accepted Answer

A)   1.10 L
B)   2.00 L
C)   2.24 L
D)   3.11 L
E)   1.85 LF) A) and B)
G) A) and E)

Question 10

Define pressure.

Accepted Answer

Pressure is the force exerted ...

Question 11

Calculate the ratio of effusion rates of Cl2 to F2.

Accepted Answer

A)   1.3661
B)   0.53588
C)   1.8661
D)   0.28716
E)   0.73204F) All of the above
G) A) and B)

Question 12

A sample of gas initially has a volume of 859 mL at 565 K and 2.20 bar. What pressure will the sample have if the volume changes to 268 mL while the temperature is increased to 815 K?

Accepted Answer

A)   10.2 bar
B)   9.83 bar
C)   15.3 bar
D)   6.53 bar
E)   1.05 barF) B) and D)
G) A) and B)

Question 13

If a scuba diver inhaled air at 3 bar pressure deep in the water and decided to swim back quickly to the surface while holding her breath, what do you expect would happen?

Accepted Answer

A)   The volume of the air in her lungs would increase by a factor of 3.
B)   The volume of the air in her lungs would decrease by a factor of 3.
C)   The volume of the air in her lungs would increase by a factor of 6.
D)   The volume of the air in her lungs would decrease by a factor of 6.
E)   The volume of the air in her lungs would not change.F) A) and E)
G) A) and D)

Question 14

Using the graph below, determine the gas that has the lowest density at STP.

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   All of the gases have the same density at STP.F) A) and E)
G) All of the above

Question 15

Which of the following statements is TRUE?

Accepted Answer

A)   Root mean square velocity is directly proportional to the molar mass of the gas.
B)   Smaller gas particles move more quickly than the larger ones.
C)   Smaller particles move more slowly than the larger ones.
D)   The molar mass of the particles has no impact on the root mean velocity.
E)   Mean free path increases with increasing pressure.F) B) and E)
G) All of the above

Question 16

Which of the following gases has the lowest average speed at 25 °C?

Accepted Answer

A)   C3H8
B)   Kr   
C)   CH3NH2
D)   SO2E) A) and C)
F) B) and D)

Question 17

The density of a gas is 1.146 g 2 C)      D)   " class="answers-bank-image d-inline" rel="preload" > at STP. What is the gas?

Accepted Answer

A)   He
B)   O2
C)   2 
C)       
D)    " class="answers-bank-image d-inline" rel="preload" > 2 
C)       
D)    " class="answers-bank-image d-inline" rel="preload" >
D)   2 
C)       
D)    " class="answers-bank-image d-inline" rel="preload" >E) A) and D)
F) A) and C)

Question 18

An unknown gas has a root mean square velocity of 332 m s-1 at 313 K. Identify the unknown gas.

Accepted Answer

A)   Kr
B)   O2
C)   Ar
D)   F2
E)   Cl2F) A) and B)
G) D) and E)

Question 19

How many molecules of CO2 are contained in a 10.0 L tank at 7.53 bar and 485 K?

Accepted Answer

A)   1.89 × 1024 molecules
B)   1.12 × 1024 molecules
C)   8.32 × 1024 molecules
D)   4.89 × 1024 molecules
E)   3.63 × 1024 moleculesF) C) and D)
G) All of the above

Question 20

A sample of 0.300 moles of nitrogen occupies 0.600 L. Under the same conditions, what number of moles occupies 1.200 L?

Accepted Answer

A)   0.600 moles
B)   1.50 moles
C)   0.33 moles
D)   6.00 molesE) A) and B)
F) A) and C)

Exam 5: Gases

A gas occupies 3.33 L at 2.23 bar. What is the volume at 2.50 bar?

Correct AnswerverifiedC

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s-1 at 381 K.

Correct AnswerverifiedShow Answer

Match the following. -barometer

Correct AnswerverifiedF

A gas mixture consists of N2, O2, and Ne, where the mole fraction of N2 is 0.55 and the mole fraction of Ne is 0.25. If the mixture is at STP in a 5.0 L container, how many molecules of O2 are present?

Correct AnswerverifiedShow Answer

Which of the following compounds will behave least like an ideal gas at low temperatures?

Correct AnswerverifiedShow Answer

Which of the following samples has the greatest density at STP?

Correct AnswerverifiedD

If NO2 and NH3 are allowed to effuse through a porous membrane under identical conditions, the rate of effusion for NH3 will be ________ times that of NO2.

Correct AnswerverifiedShow Answer

What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.57 bar if the F2 has a volume of 25.0 mL at 1.22 bar?

Correct AnswerverifiedShow Answer

What volume will 4.91 × 1022 atoms of Ne occupy at STP?

Correct AnswerverifiedShow Answer

Define pressure.

Correct AnswerverifiedPressure is the force exerted ...View AnswerShow Answer

Calculate the ratio of effusion rates of Cl2 to F2.

Correct AnswerverifiedShow Answer

A sample of gas initially has a volume of 859 mL at 565 K and 2.20 bar. What pressure will the sample have if the volume changes to 268 mL while the temperature is increased to 815 K?

Correct AnswerverifiedShow Answer

If a scuba diver inhaled air at 3 bar pressure deep in the water and decided to swim back quickly to the surface while holding her breath, what do you expect would happen?

Correct AnswerverifiedShow Answer

Using the graph below, determine the gas that has the lowest density at STP.

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

Which of the following gases has the lowest average speed at 25 °C?

Correct AnswerverifiedShow Answer

The density of a gas is 1.146 g at STP. What is the gas?

Correct AnswerverifiedShow Answer

An unknown gas has a root mean square velocity of 332 m s-1 at 313 K. Identify the unknown gas.

Correct AnswerverifiedShow Answer

How many molecules of CO2 are contained in a 10.0 L tank at 7.53 bar and 485 K?

Correct AnswerverifiedShow Answer

A sample of 0.300 moles of nitrogen occupies 0.600 L. Under the same conditions, what number of moles occupies 1.200 L?

Correct AnswerverifiedShow Answer

Correct Answer
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C

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s^-1 at 381 K.

Correct Answer
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F

A gas mixture consists of N₂, O₂, and Ne, where the mole fraction of N₂ is 0.55 and the mole fraction of Ne is 0.25. If the mixture is at STP in a 5.0 L container, how many molecules of O₂ are present?

Correct Answer
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D

If NO₂ and NH₃ are allowed to effuse through a porous membrane under identical conditions, the rate of effusion for NH₃ will be ________ times that of NO₂.

Correct Answer
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What volume (in mL) will a sample of F₂ gas occupy in a syringe at 5.57 bar if the F₂ has a volume of 25.0 mL at 1.22 bar?

Correct Answer
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What volume will 4.91 × 10²²atoms of Ne occupy at STP?

Correct Answer
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Pressure is the force exerted ...
View Answer

Calculate the ratio of effusion rates of Cl₂ to F₂.

Correct Answer
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An unknown gas has a root mean square velocity of 332 m s^-1 at 313 K. Identify the unknown gas.

Correct Answer
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How many molecules of CO₂ are contained in a 10.0 L tank at 7.53 bar and 485 K?

Correct Answer
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Correct Answer
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