Question 1

Calculate the temperature if 0.0139 moles of Ne has a pressure of 1.237 bar in a 250 mL container.

Accepted Answer

A) 260 °C 
B) 61.8 °C 
C) -23.8 °C 
D) 15.4 °C 
E) -5.57 °C 
A) 260 °C 
B) 61.8 °C 
C) -23.8 °C 
D) 15.4 °C 
E) -5.57 °C

Question 2

How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g)+ 2O2(g)→ CO2(g)+ 2H2O(l)

Accepted Answer

A) 13.9 L 
B) 27.8 L 
C) 56.0 L 
D) 60.5 L 
A) 13.9 L 
B) 27.8 L 
C) 56.0 L 
D) 60.5 L

Question 3

A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.43 bar. What is the identity of the halogen?

Accepted Answer

A) Br2 
B) F2 
C) Cl2 
D) I2 
E) Ge 
A) Br2 
B) F2 
C) Cl2 
D) I2 
E) Ge

Question 4

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 5

In a container containing CO, H2, and O2, what is the mole fraction of CO if the H2 mole fraction is 0.22 and the O2 mole fraction is 0.58?

Accepted Answer

A) 0.20 
B) 0.30 
C) 0.10 
D) 0.50 
A) 0.20 
B) 0.30 
C) 0.10 
D) 0.50

Question 6

Consider a container of gas under a particular P, V, T set of conditions. Describe how the pressure would change if the volume were doubled while the absolute temperature was increasing by a factor of 2.

Accepted Answer

The pressure would stay constant. The do

Question 7

A balloon filled with helium gas at 20 °C occupies 4.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at -196 °C, while the pressure is raised to 5.20 atm. What is the volume of the balloon in the liquid nitrogen?

Accepted Answer

A) 0.25 L 
B) 3.6 L 
C) 6.7 L 
D) 97 L 
A) 0.25 L 
B) 3.6 L 
C) 6.7 L 
D) 97 L

Question 8

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.95 bar. What is the pressure of CO?

Accepted Answer

A) 1.86 bar 
B) 0.649 bar 
C) 0.536 bar 
D) 1.54 bar 
E) 0.955 bar 
A) 1.86 bar 
B) 0.649 bar 
C) 0.536 bar 
D) 1.54 bar 
E) 0.955 bar

Question 9

The volume of 350. mL of gas at 25 °C is decreased to 135 mL at constant pressure. What is the final temperature of the gas?

Accepted Answer

A) -158 °C 
B) 9.6 °C 
C) 65 °C 
D) 500 °C 
A) -158 °C 
B) 9.6 °C 
C) 65 °C 
D) 500 °C

Question 10

You have three cylinders containing O2 gas at the same volume and pressure. Cylinder A is at -15 °C, cylinder B is at -5 °F, cylinder C is at 255 K. Which cylinder contains the largest mass of oxygen?

Accepted Answer

A) cylinder A 
B) cylinder B 
C) cylinder C 
D) All cylinders contain the same mass of O2. 
A) cylinder A 
B) cylinder B 
C) cylinder C 
D) All cylinders contain the same mass of O2.

Question 11

Why does the rate of effusion increase with a decrease in the molar mass?

Accepted Answer

The rate of effusion depends o

Question 12

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.989 bar. What is the pressure of H2?

Accepted Answer

A) 1.17 bar 
B) 0.865 bar 
C) 1.03 bar 
D) 0.969 bar 
E) 0.649 bar 
A) 1.17 bar 
B) 0.865 bar 
C) 1.03 bar 
D) 0.969 bar 
E) 0.649 bar

Question 13

Match the following.

-Charles's law

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 14

A 0.600 g sample containing Ag2O and inert material is heated, causing the silver oxide to decompose according to the following equation: 2Ag2O(s)→ 4Ag(s)+ O2(g)
If 13.8 mL of gas are collected over water at 27 °C and 1.001 bar external pressure, what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mmHg at 27 °C.

Accepted Answer

A) 10.4% 
B) 20.9% 
C) 41.8% 
D) 44.8% 
A) 10.4% 
B) 20.9% 
C) 41.8% 
D) 44.8%

Question 15

Match the following.

-Ideal gas law

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 16

Which of the following gases has the lowest root mean square velocity at constant temperature? NH3 CO2 NO2 F2 O3

Accepted Answer

A) NH3 
B) CO2 
C) NO2 
D) F2 
E) O3 
A) NH3 
B) CO2 
C) NO2 
D) F2 
E) O3

Question 17

What is the volume of 5.60 g of O2 at 7.78 bar and 415 K?

Accepted Answer

A) 1.53 L 
B) 565 L 
C) 24.5 L 
D) 25.0 L 
E) 0.776 L 
A) 1.53 L 
B) 565 L 
C) 24.5 L 
D) 25.0 L 
E) 0.776 L

Question 18

Match the following.

-Avogadro's law

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 19

Define the vapour pressure of water.

Accepted Answer

A) partial pressure of water in a liquid mixture 
B) partial pressure of water in a gaseous mixture 
C) condensation of water 
D) water dissolved in a liquid 
E) water molecules 
A) partial pressure of water in a liquid mixture 
B) partial pressure of water in a gaseous mixture 
C) condensation of water 
D) water dissolved in a liquid 
E) water molecules

Question 20

Calculate the root mean square velocity of molecular hydrogen at 251.0 K.

Accepted Answer

A) 1692 m s-1 
B) 1875 m s-1 
C) 1342 m s-1 
D) 715.6 m s-1 
E) 1762 m s-1 
A) 1692 m s-1 
B) 1875 m s-1 
C) 1342 m s-1 
D) 715.6 m s-1 
E) 1762 m s-1

Exam 5: Gases

Calculate the temperature if 0.0139 moles of Ne has a pressure of 1.237 bar in a 250 mL container.

How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g)+ 2O2(g)→ CO2(g)+ 2H2O(l)

A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.43 bar. What is the identity of the halogen?

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?

In a container containing CO, H2, and O2, what is the mole fraction of CO if the H2 mole fraction is 0.22 and the O2 mole fraction is 0.58?

Consider a container of gas under a particular P, V, T set of conditions. Describe how the pressure would change if the volume were doubled while the absolute temperature was increasing by a factor of 2.

A balloon filled with helium gas at 20 °C occupies 4.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at -196 °C, while the pressure is raised to 5.20 atm. What is the volume of the balloon in the liquid nitrogen?

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.95 bar. What is the pressure of CO?

The volume of 350. mL of gas at 25 °C is decreased to 135 mL at constant pressure. What is the final temperature of the gas?

You have three cylinders containing O2 gas at the same volume and pressure. Cylinder A is at -15 °C, cylinder B is at -5 °F, cylinder C is at 255 K. Which cylinder contains the largest mass of oxygen?

Why does the rate of effusion increase with a decrease in the molar mass?

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.989 bar. What is the pressure of H2?

Match the following. -Charles's law

Match the following. -Ideal gas law

Which of the following gases has the lowest root mean square velocity at constant temperature? NH3 CO2 NO2 F2 O3

What is the volume of 5.60 g of O2 at 7.78 bar and 415 K?

Match the following. -Avogadro's law

Define the vapour pressure of water.

Calculate the root mean square velocity of molecular hydrogen at 251.0 K.

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Chemical Reactions and Stoichiometry

Thermochemistry

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Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

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

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Filters

How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH₄(g)+ 2O₂(g)→ CO₂(g)+ 2H₂O(l)

In a container containing CO, H₂, and O₂, what is the mole fraction of CO if the H₂ mole fraction is 0.22 and the O₂ mole fraction is 0.58?

A mixture of 0.220 moles CO, 0.350 moles H₂, and 0.640 moles He has a total pressure of 2.95 bar. What is the pressure of CO?

You have three cylinders containing O₂ gas at the same volume and pressure. Cylinder A is at -15 °C, cylinder B is at -5 °F, cylinder C is at 255 K. Which cylinder contains the largest mass of oxygen?

A mixture of 0.220 moles CO, 0.350 moles H₂, and 0.640 moles He has a total pressure of 2.989 bar. What is the pressure of H₂?

Which of the following gases has the lowest root mean square velocity at constant temperature? NH₃ CO₂ NO₂ F₂ O₃

What is the volume of 5.60 g of O₂ at 7.78 bar and 415 K?