Question 1

The volume of a gas is proportional to the temperature of a gas. What is this known as?

Accepted Answer

A)  Avogadro's law 
B)  Ideal gas law 
C)  Charles's law 
D)  Boyle's law 
E)  Dalton's law 
A)  Avogadro's law 
B)  Ideal gas law 
C)  Charles's law 
D)  Boyle's law 
E)  Dalton's law

Question 2

What is the volume of 30.0 g of argon gas at 157 °C and 0.0250 bar?

Accepted Answer

A)  3.87 L 
B)  10.6 L 
C)  393 L 
D)  1070 L 
A)  3.87 L 
B)  10.6 L 
C)  393 L 
D)  1070 L

Question 3

Match the following.
-sphygmomanometer

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 gas
F)measures atmospheric pressure
G)measures blood pressure
H)P1V1 = P2V2 
A) PV = nRT 
B) V1/T1 = V2/T2 
C) V1/n1 = V2/n2 
D) PT = PA + PB + PC ... 
E) measures pressure of a gas
F)measures atmospheric pressure
G)measures blood pressure
H)P1V1 = P2V2

Question 4

Match the following.
-Avogadro's law

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 gas
F)measures atmospheric pressure
G)measures blood pressure
H)P1V1 = P2V2 
A) PV = nRT 
B) V1/T1 = V2/T2 
C) V1/n1 = V2/n2 
D) PT = PA + PB + PC ... 
E) measures pressure of a gas
F)measures atmospheric pressure
G)measures blood pressure
H)P1V1 = P2V2

Question 5

Calculate the root mean square velocity of nitrogen molecules at 25 °C.

Accepted Answer

A)  729 m s-1 
B)  515 m s-1 
C)  149 m s-1 
D)  297 m s-1 
A)  729 m s-1 
B)  515 m s-1 
C)  149 m s-1 
D)  297 m s-1

Question 6

Determine the theoretical yield and the percent yield if 21.8 g of K2CO3 is produced from reacting 27.9 g KO2 with 29.0 L of CO2 (at STP). The molar mass of KO2 is 71.10 g mol-1 and K2CO3 is 138.21 g mol-1. 4KO2(s) + 2CO2(g) → 2K2CO3(s) + 3O2(g)

Accepted Answer

A)  27.1 g, 80.4% yield 
B)  179 g, 12.2% yield 
C)  91.7 g, 23.8% yield 
D)  206 g, 10.6% yield 
E)  61.0 g, 35.7% yield 
A)  27.1 g, 80.4% yield 
B)  179 g, 12.2% yield 
C)  91.7 g, 23.8% yield 
D)  206 g, 10.6% yield 
E)  61.0 g, 35.7% yield

Question 7

According to Charles's law, volume of a gas ________ with increasing temperature. Charles's law assumes constant pressure and a constant amount of gas.

Accepted Answer

A)  decreases 
B)  increases 
C)  doesn't change 
D)  increases and then decreases 
E)  decreases and then increases 
A)  decreases 
B)  increases 
C)  doesn't change 
D)  increases and then decreases 
E)  decreases and then increases

Question 8

Convert 3.1473 atm to bar.

Accepted Answer

A)  4.976 bar 
B)  3.189 bar 
C)  2.577 bar 
D)  4.112 bar 
E)  3.875 bar 
A)  4.976 bar 
B)  3.189 bar 
C)  2.577 bar 
D)  4.112 bar 
E)  3.875 bar

Question 9

Which of the following gases has the highest average speed at 400 K?

Accepted Answer

A)  N2 
B)  O2   
C)  F2 
D)  Cl2 
A)  N2 
B)  O2   
C)  F2 
D)  Cl2

Question 10

Which of the following samples will have the greatest average speed at 355 K?

Accepted Answer

A)  Ne 
B)  C2H4 
C)  Cl2 
D)  CH4 
E)  All of these samples will have the same average speed at the same temperature. 
A)  Ne 
B)  C2H4 
C)  Cl2 
D)  CH4 
E)  All of these samples will have the same average speed at the same temperature.

Question 11

A syringe contains 0.65 moles of He gas that occupy 750.0 mL. What volume (in L) of gas will the syringe hold if 0.35 moles of Ne is added?

Accepted Answer

A)  0.87 L 
B)  4.9 L 
C)  1.2 L 
D)  2.1 L 
E)  1.9 L 
A)  0.87 L 
B)  4.9 L 
C)  1.2 L 
D)  2.1 L 
E)  1.9 L

Question 12

Determine the mass of water formed when 12.5 L NH3 (at 298 K and 1.50 bar) is reacted with 18.9 L of O2 (at 323 K and 1.1 bar). 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

Accepted Answer

A)  16.7 g H2O 
B)  20.7 g H2O 
C)  37.7 g H2O 
D)  13.8 g H2O 
E)  27.9 g H2O 
A)  16.7 g H2O 
B)  20.7 g H2O 
C)  37.7 g H2O 
D)  13.8 g H2O 
E)  27.9 g H2O

Question 13

Identify the gas that is the lowest percent by volume in dry air.

Accepted Answer

A)  CO2 
B)  Ar 
C)  O2 
D)  N2 
A)  CO2 
B)  Ar 
C)  O2 
D)  N2

Question 14

Name the major gas in dry air.

Accepted Answer

nitrogen o

Question 15

If 0.3781 g of a gas with a molecular weight of 18.015 g   is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

Accepted Answer

A)  0.682 bar 
B)  0.109 bar 
C)  0.0867 bar 
D)  0.132 bar 
E)  0.0963 bar 
A)  0.682 bar 
B)  0.109 bar 
C)  0.0867 bar 
D)  0.132 bar 
E)  0.0963 bar

Question 16

What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0 L container at 1.069 bar?

Accepted Answer

A)  -23°C 
B)  228°C 
C)  250°C 
D)  500°C 
A)  -23°C 
B)  228°C 
C)  250°C 
D)  500°C

Question 17

Which of the following would have a density of 1.37 g L-1 at 7.0 °C and 0.9967 bar?

Accepted Answer

A)  N2 
B)  O2 
C)  Kr  
D)  Rn  
A)  N2 
B)  O2 
C)  Kr  
D)  Rn

Question 18

The mole fraction of argon in dry air near sea level is 1.818 ×   , where the molar mass of argon is 39.948. The concentration of argon in the atmosphere is ________ ppm.

Accepted Answer

A)  9.3 × 10-9 
B)  0.93   
C)  9.3 × 106 
D)  1.1 × 108 
E)  18.18 
A)  9.3 × 10-9 
B)  0.93   
C)  9.3 × 106 
D)  1.1 × 108 
E)  18.18

Question 19

A 0. 286 g sample of gas occupies 125 mL at 0.7985 bar and 25 °C. What is the molar mass of the gas?

Accepted Answer

A)  5.9 g mol-1 
B)  44 g mol-1 
C)  59 g mol-1 
D)  71 g mol-1 
A)  5.9 g mol-1 
B)  44 g mol-1 
C)  59 g mol-1 
D)  71 g mol-1

Question 20

What mass of NO2 is contained in a 13.0 L tank at 4.58 bar and 385 K?

Accepted Answer

A)  18.8 g 
B)  53.1 g 
C)  24.4 g 
D)  85.6 g 
E)  69.2 g 
A)  18.8 g 
B)  53.1 g 
C)  24.4 g 
D)  85.6 g 
E)  69.2 g

Exam 5: Gases

The volume of a gas is proportional to the temperature of a gas. What is this known as?

What is the volume of 30.0 g of argon gas at 157 °C and 0.0250 bar?

Match the following. -sphygmomanometer

Match the following. -Avogadro's law

Calculate the root mean square velocity of nitrogen molecules at 25 °C.

Determine the theoretical yield and the percent yield if 21.8 g of K2CO3 is produced from reacting 27.9 g KO2 with 29.0 L of CO2 (at STP). The molar mass of KO2 is 71.10 g mol-1 and K2CO3 is 138.21 g mol-1. 4KO2(s) + 2CO2(g) → 2K2CO3(s) + 3O2(g)

According to Charles's law, volume of a gas ________ with increasing temperature. Charles's law assumes constant pressure and a constant amount of gas.

Convert 3.1473 atm to bar.

Which of the following gases has the highest average speed at 400 K?

Which of the following samples will have the greatest average speed at 355 K?

A syringe contains 0.65 moles of He gas that occupy 750.0 mL. What volume (in L) of gas will the syringe hold if 0.35 moles of Ne is added?

Determine the mass of water formed when 12.5 L NH3 (at 298 K and 1.50 bar) is reacted with 18.9 L of O2 (at 323 K and 1.1 bar). 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

Identify the gas that is the lowest percent by volume in dry air.

Name the major gas in dry air.

If 0.3781 g of a gas with a molecular weight of 18.015 g is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0 L container at 1.069 bar?

Which of the following would have a density of 1.37 g L-1 at 7.0 °C and 0.9967 bar?

The mole fraction of argon in dry air near sea level is 1.818 × , where the molar mass of argon is 39.948. The concentration of argon in the atmosphere is ________ ppm.

A 0. 286 g sample of gas occupies 125 mL at 0.7985 bar and 25 °C. What is the molar mass of the gas?

What mass of NO2 is contained in a 13.0 L tank at 4.58 bar and 385 K?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry Ii: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Determine the theoretical yield and the percent yield if 21.8 g of K₂CO₃ is produced from reacting 27.9 g KO₂ with 29.0 L of CO₂ (at STP). The molar mass of KO₂ is 71.10 g mol^-1 and K₂CO₃is 138.21 g mol^-1. 4KO₂(s) + 2CO₂(g) → 2K₂CO₃(s) + 3O₂(g)

Determine the mass of water formed when 12.5 L NH₃ (at 298 K and 1.50 bar) is reacted with 18.9 L of O₂ (at 323 K and 1.1 bar). 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Which of the following would have a density of 1.37 g L^-1 at 7.0 °C and 0.9967 bar?

What mass of NO₂ is contained in a 13.0 L tank at 4.58 bar and 385 K?