Question 1

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) 0.73204 
A) 1.3661 
B) 0.53588 
C) 1.8661 
D) 0.28716 
E) 0.73204

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

Determine the volume of SO2 (at STP)formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 bar). The molar mass of FeS2 is 119.99 g mol-1. 4FeS2(s)+ 11O2(g)→ 2Fe2O3(s)+ 8SO2(g)

Accepted Answer

A) 36.1 L 
B) 45.3 L 
C) 18.1 L 
D) 27.6 L 
E) 36.6 L 
A) 36.1 L 
B) 45.3 L 
C) 18.1 L 
D) 27.6 L 
E) 36.6 L

Question 4

Identify the gas particle that travels the slowest.

Accepted Answer

A) H2 
B) O2 
C) Ne 
D) N2 
E) CO 
A) H2 
B) O2 
C) Ne 
D) N2 
E) CO

Question 5

Determine the total volume of all gases (at STP)formed when 50.0 mL of TNT (C3H5(NO3)3, d = 1.60 g mL-1, molar mass = 227.10 g mol-1)reacts according to the following reaction: 4C3H5(NO3)3(l)→ 6N2(g)+ O2(g)+ 12CO2(g)+ 10H2O(g)

Accepted Answer

A) 4.93 L 
B) 58.0 L 
C) 29.6 L 
D) 448 L 
E) 175 L 
A) 4.93 L 
B) 58.0 L 
C) 29.6 L 
D) 448 L 
E) 175 L

Question 6

A mixture of N2, O2, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 bar?

Accepted Answer

A) 2.5 bar 
B) 0.39 bar 
C) 0.67 bar 
D) 0.98 bar 
E) 1.33 bar 
A) 2.5 bar 
B) 0.39 bar 
C) 0.67 bar 
D) 0.98 bar 
E) 1.33 bar

Question 7

Which statement is TRUE about kinetic molecular theory?

Accepted Answer

A) A single particle does not move in a straight line. 
B) The size of the particle is large compared to the volume. 
C) The collisions of particles with one another are completely elastic. 
D) The average kinetic energy of a particle is not proportional to the temperature. 
A) A single particle does not move in a straight line. 
B) The size of the particle is large compared to the volume. 
C) The collisions of particles with one another are completely elastic. 
D) The average kinetic energy of a particle is not proportional to the temperature.

Question 8

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) Cl2 
A) Kr 
B) O2 
C) Ar 
D) F2 
E) Cl2

Question 9

Which of the following will cause the volume of an ideal gas to triple in value?

Accepted Answer

A) raising the temperature from 25 °C to 75 °C at constant pressure 
B) lowering the absolute temperature by a factor of 3 at constant pressure 
C) raising the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3 
D) lowering the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3 
E) lowering the pressure by a factor of 3 while the temperature stays constant 
A) raising the temperature from 25 °C to 75 °C at constant pressure 
B) lowering the absolute temperature by a factor of 3 at constant pressure 
C) raising the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3 
D) lowering the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3 
E) lowering the pressure by a factor of 3 while the temperature stays constant

Question 10

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

Question 11

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container. Which of the following statements is TRUE?

Accepted Answer

A) Both gases have the same average kinetic energy. 
B) Both gases contribute equally to the density of the mixture under these conditions. 
C) Both gases have the same molecular speed. 
D) The mixture has a volume of 22.4 L. 
E) All of the above are true. 
A) Both gases have the same average kinetic energy. 
B) Both gases contribute equally to the density of the mixture under these conditions. 
C) Both gases have the same molecular speed. 
D) The mixture has a volume of 22.4 L. 
E) All of the above are true.

Question 12

A container filled with gas is connected to an open-end manometer that is filled with mineral oil. The pressure in the gas container is 753 mmHg and atmospheric pressure is 724 mmHg. How high will the level rise in the manometer if the densities of Hg and mineral oil are 13.6 g mL-1 and 0.822 g mL-1, respectively?

Accepted Answer

A) 1.75 mm 
B) 23.8 mm 
C) 29.0 mm 
D) 480 mm 
A) 1.75 mm 
B) 23.8 mm 
C) 29.0 mm 
D) 480 mm

Question 13

A 45.0 L steel tank at 20.0 °C contains acetylene gas, C2H2, at a pressure of 1.41 bar. Assuming ideal behaviour, how many grams of acetylene are in the tank?

Accepted Answer

A) 2.60 g 
B) 10.0 g 
C) 67.8 g 
D) 990 g 
A) 2.60 g 
B) 10.0 g 
C) 67.8 g 
D) 990 g

Question 14

Match the following.

-sphygmomanometer

Accepted Answer

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

Question 15

Explain what the term "mean free path" describes. How does it change with decreasing pressure?

Accepted Answer

Mean free path describes the distance th

Question 16

Match the following.

-manometer

Accepted Answer

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

Question 17

What pressure (in bar)will 0.44 moles of CO2 exert in a 2.6 L container at 25 °C?

Accepted Answer

A) 0.35 bar 
B) 4.2 bar 
C) 4.7 bar 
D) 8.6 bar 
E) 3.6 bar 
A) 0.35 bar 
B) 4.2 bar 
C) 4.7 bar 
D) 8.6 bar 
E) 3.6 bar

Question 18

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 molecules 
A) 1.89 × 1024 molecules 
B) 1.12 × 1024 molecules 
C) 8.32 × 1024 molecules 
D) 4.89 × 1024 molecules 
E) 3.63 × 1024 molecules

Question 19

Why doesn't Dalton's law of partial pressures depend on the identity of the gases present?

Accepted Answer

It is assumed that all gas particles are

Question 20

Calculate the mass of nitrogen dioxide, NO2, required if a 5.00 L container is to be filled to 0.6478 bar at a temperature of 1.00 °C.

Accepted Answer

A) 5.40 g 
B) 8.14 g 
C) 3.97 g 
D) 5.09 g 
E) 6.54 g 
A) 5.40 g 
B) 8.14 g 
C) 3.97 g 
D) 5.09 g 
E) 6.54 g

Exam 5: Gases

Calculate the ratio of effusion rates of Cl2 to F2.

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

Determine the volume of SO2 (at STP)formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 bar). The molar mass of FeS2 is 119.99 g mol-1. 4FeS2(s)+ 11O2(g)→ 2Fe2O3(s)+ 8SO2(g)

Identify the gas particle that travels the slowest.

Determine the total volume of all gases (at STP)formed when 50.0 mL of TNT (C3H5(NO3)3, d = 1.60 g mL-1, molar mass = 227.10 g mol-1)reacts according to the following reaction: 4C3H5(NO3)3(l)→ 6N2(g)+ O2(g)+ 12CO2(g)+ 10H2O(g)

A mixture of N2, O2, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 bar?

Which statement is TRUE about kinetic molecular theory?

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

Which of the following will cause the volume of an ideal gas to triple in value?

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?

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container. Which of the following statements is TRUE?

A 45.0 L steel tank at 20.0 °C contains acetylene gas, C2H2, at a pressure of 1.41 bar. Assuming ideal behaviour, how many grams of acetylene are in the tank?

Match the following. -sphygmomanometer

Explain what the term "mean free path" describes. How does it change with decreasing pressure?

Match the following. -manometer

What pressure (in bar)will 0.44 moles of CO2 exert in a 2.6 L container at 25 °C?

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

Why doesn't Dalton's law of partial pressures depend on the identity of the gases present?

Calculate the mass of nitrogen dioxide, NO2, required if a 5.00 L container is to be filled to 0.6478 bar at a temperature of 1.00 °C.

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

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Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

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Chemistry of the Nonmetals

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Filters

Calculate the ratio of effusion rates of Cl₂ to F₂.

Determine the volume of SO₂ (at STP)formed from the reaction of 96.7 g of FeS₂ and 55.0 L of O₂ (at 398 K and 1.20 bar). The molar mass of FeS₂ is 119.99 g mol^-1. 4FeS₂(s)+ 11O₂(g)→ 2Fe₂O₃(s)+ 8SO₂(g)

Determine the total volume of all gases (at STP)formed when 50.0 mL of TNT (C₃H₅(NO₃)₃, d = 1.60 g mL^-1, molar mass = 227.10 g mol^-1)reacts according to the following reaction: 4C₃H₅(NO₃)₃(l)→ 6N₂(g)+ O₂(g)+ 12CO₂(g)+ 10H₂O(g)

A mixture of N₂, O₂, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N₂ if the total pressure of the mixture is 3.9 bar?

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

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?

A 45.0 L steel tank at 20.0 °C contains acetylene gas, C₂H₂, at a pressure of 1.41 bar. Assuming ideal behaviour, how many grams of acetylene are in the tank?

What pressure (in bar)will 0.44 moles of CO₂ exert in a 2.6 L container at 25 °C?

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

Calculate the mass of nitrogen dioxide, NO₂, required if a 5.00 L container is to be filled to 0.6478 bar at a temperature of 1.00 °C.