Question 1

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

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 < C2H6 
A) Ar < HCl <PH3 < C2H6 
B) C2H6 < PH3 < HCl < Ar 
C) Ar < PH3 < C2H6 < HCl 
D) C2H6 < HCl < PH3 < Ar 
E) Ar <PH3 < HCl < C2H6 A

Question 2

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

Question 3

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

Question 4

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

Question 5

"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's 
A) Charles' 
B) Boyle's 
C) Amontons' 
D) Avogadro's 
E) Dalton's

Question 6

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

Question 7

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

Question 8

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 torr 
A) 23.2 atm 
B) 27.1 atm 
C) 32.8 atm 
D) 42.0 atm 
E) 32.8 torr

Question 9

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) CCl4 
A) CHCl3 
B) CH2Cl2 
C) C2H2Cl2 
D) C2H3Cl 
E) CCl4

Question 10

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

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 13

"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's 
A) Charles' 
B) Boyle's 
C) Amontons' 
D) Avogadro's 
E) Dalton's

Question 14

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

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 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 17

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

Question 18

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) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 19

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

Question 20

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

Exam 5: Gases and the Kinetic-Molecular Theory

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

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?

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

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?

"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.

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

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.

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)

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.

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?

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

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

"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.

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?

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

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.

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?

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?

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

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

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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)