Question 1

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and
5)0 mol of Ne in the flask. The partial pressure of He is atm.

Accepted Answer

A)  6.5 
B)  1.86 
C)  1.04 
D)  9.1 
E)  0.74 
A)  6.5 
B)  1.86 
C)  1.04 
D)  9.1 
E)  0.74

Question 2

The pressure of a sample of CH4 gas (6.022 g) in a 30.0 L vessel at 402 K is _ atm.

Accepted Answer

A)  12.4 
B)  0.414 
C)  6.62 
D)  2.42 
E)  22.4 
A)  12.4 
B)  0.414 
C)  6.62 
D)  2.42 
E)  22.4

Question 3

A balloon originally had a volume of 4.39 L at 44 °C and a pressure of 729 torr. The balloon must be cooled to °C to reduce its volume to 3.78 L (at constant pressure)

Accepted Answer

A)  546 
B)  72.9 
C)  273 
D)  38 
E)  0 
A)  546 
B)  72.9 
C)  273 
D)  38 
E)  0

Question 4

A mixture of two gases was allowed to effuse from a container. One of the gases escaped from the container 1.43 times as fast as the other one. The two gases could have been _.

Accepted Answer

A)  CO and CO2 
B)  Cl2 and SF6 
C)  O2 and SF6 
D)  O2 and Cl2 
E)  CO and SF6 
A)  CO and CO2 
B)  Cl2 and SF6 
C)  O2 and SF6 
D)  O2 and Cl2 
E)  CO and SF6

Question 5

The mass of nitrogen dioxide contained in a 4.32 L vessel at 48 °C and 141600 Pa is _ _g)

Accepted Answer

A)  10.5 
B)  5.35 × 104 
C)  9.46 × 10- 2 
D)  53.5 
E)  70.5 
A)  10.5 
B)  5.35 × 104 
C)  9.46 × 10- 2 
D)  53.5 
E)  70.5

Question 6

If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy L at STP.

Accepted Answer

A)  50.8 
B)  25.5 
C)  5.08 
D)  12.9 
E)  3.92 
A)  50.8 
B)  25.5 
C)  5.08 
D)  12.9 
E)  3.92

Question 7

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, under the same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is _ g/mol.

Accepted Answer

A)  19 
B)  5.5 
C)  350 
D)  88 
E)  0.19 
A)  19 
B)  5.5 
C)  350 
D)  88 
E)  0.19

Question 8

The density of chlorine gas at 1.21 atm and 34.9 °C is g/L.

Accepted Answer

A)  1.70 
B)  3.39 
C)  0.0479 
D)  0.295 
E)  0.423 
A)  1.70 
B)  3.39 
C)  0.0479 
D)  0.295 
E)  0.423

Question 9

A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is atm.

Accepted Answer

A)  3.3 
B)  1.5 
C)  15 
D)  7.5 
E)  0.67 
A)  3.3 
B)  1.5 
C)  15 
D)  7.5 
E)  0.67

Question 10

Of the following, has the odor of rotting eggs.

Accepted Answer

A)  NO2  
B)  NH3  
C)  CO 
D)  H2S 
E)  HCN 
A)  NO2  
B)  NH3  
C)  CO 
D)  H2S 
E)  HCN

Question 11

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0 °C and 4.31 atm is mL.

Accepted Answer

A)  104 
B)  210 
C)  10.4 
D)  420 
E)  79.9 
A)  104 
B)  210 
C)  10.4 
D)  420 
E)  79.9

Question 12

The volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62 °C. The gas is .

Accepted Answer

A)  Ne 
B)  NH3  
C)  NO2  
D)  SO2  
E)  SO3 
A)  Ne 
B)  NH3  
C)  NO2  
D)  SO2  
E)  SO3

Question 13

Ammonium nitrite undergoes thermal decomposition to produce only gases:
 
What volume (L) of gas is produced by the decomposition of 35.0 g of NH4NO2 (s) at 525 ° C and
1)5 atm?

Accepted Answer

A)  47 
B)  160 
C)  24 
D)  72 
E)  15 
A)  47 
B)  160 
C)  24 
D)  72 
E)  15

Question 14

A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture?

Accepted Answer

A)  12.0 
B)  11.0 
C)  9.25 
D)  5.00 
E)  6.75 
A)  12.0 
B)  11.0 
C)  9.25 
D)  5.00 
E)  6.75

Question 15

Of the following, _ is a correct statement of Boyle's law.

Accepted Answer

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

Question 16

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl:
 
What volume (L) of CO is formed from the complete decomposition of 444 g of Ni(CO)4 at 752 torr and 22.0 °C?

Accepted Answer

A)  20.2 
B)  255 
C)  0.356 
D)  11.0 
E)  63.7 
A)  20.2 
B)  255 
C)  0.356 
D)  11.0 
E)  63.7

Question 17

Of the following, is a valid statement of Charles' law.

Accepted Answer

A)    constant 
B)    constant 
C)  PV = constant 
D)  V = constant × P 
E)  V = constant × n 
A)    constant 
B)    constant 
C)  PV = constant 
D)  V = constant × P 
E)  V = constant × n

Question 18

A gas in a 325 mL container has a pressure of 695 torr at 19 °C. There are _ _ mol of gas in the flask.

Accepted Answer

A)  1.48 × 10- 2 
B)  12.4 
C)  1.24 × 10- 2 
D)  80.6 
E)  9.42 
A)  1.48 × 10- 2 
B)  12.4 
C)  1.24 × 10- 2 
D)  80.6 
E)  9.42

Question 19

What is the partial pressure (in mm Hg) of neon in a 4.00 L vessel that contains 0.838 mol of methane, 0.184 mol of ethane, and 0.755 mol of neon at a total pressure of 928 mmHg?

Accepted Answer

The answer of What is the partial pressure (in mm...

Question 20

A sample of an unknown volatile liquid was injected into a Dumas flask (mflask = 27.0928 g, Vflask = 0.1040 L) and heated until no visible traces of the liquid could be found. The flask and its contents were then rapidly cooled and reweighed (mflask+vapor = 27.4593 g). The atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °C, respectively. The unknown volatile liquid was .

Accepted Answer

A)  C7H16  
B)  C6H6  
C)  C6H12  
D)  C7H14  
E)  C6H14 
A)  C7H16  
B)  C6H6  
C)  C6H12  
D)  C7H14  
E)  C6H14

Exam 10: Gases

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5)0 mol of Ne in the flask. The partial pressure of He is atm.

The pressure of a sample of CH4 gas (6.022 g) in a 30.0 L vessel at 402 K is _ atm.

A balloon originally had a volume of 4.39 L at 44 °C and a pressure of 729 torr. The balloon must be cooled to °C to reduce its volume to 3.78 L (at constant pressure)

A mixture of two gases was allowed to effuse from a container. One of the gases escaped from the container 1.43 times as fast as the other one. The two gases could have been _.

The mass of nitrogen dioxide contained in a 4.32 L vessel at 48 °C and 141600 Pa is _ _g)

If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy L at STP.

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, under the same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is _ g/mol.

The density of chlorine gas at 1.21 atm and 34.9 °C is g/L.

A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is atm.

Of the following, has the odor of rotting eggs.

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0 °C and 4.31 atm is mL.

The volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62 °C. The gas is .

Ammonium nitrite undergoes thermal decomposition to produce only gases: What volume (L) of gas is produced by the decomposition of 35.0 g of NH4NO2 (s) at 525 ° C and 1)5 atm?

A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture?

Of the following, _ is a correct statement of Boyle's law.

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: What volume (L) of CO is formed from the complete decomposition of 444 g of Ni(CO)4 at 752 torr and 22.0 °C?

Of the following, is a valid statement of Charles' law.

A gas in a 325 mL container has a pressure of 695 torr at 19 °C. There are _ _ mol of gas in the flask.

What is the partial pressure (in mm Hg) of neon in a 4.00 L vessel that contains 0.838 mol of methane, 0.184 mol of ethane, and 0.755 mol of neon at a total pressure of 928 mmHg?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

The pressure of a sample of CH₄gas (6.022 g) in a 30.0 L vessel at 402 K is _ atm.

Ammonium nitrite undergoes thermal decomposition to produce only gases: What volume (L) of gas is produced by the decomposition of 35.0 g of NH₄NO₂(s) at 525 ° C and 1)5 atm?

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: What volume (L) of CO is formed from the complete decomposition of 444 g of Ni(CO)₄at 752 torr and 22.0 °C?