Question 1

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) 2.42 
B) 6.62 
C) 0.413 
D) 12.4 
E) 22.4 
A) 2.42 
B) 6.62 
C) 0.413 
D) 12.4 
E) 22.4

Question 2

The volume occupied by 1.5 mol of gas at 35 °C and 2.0 atm pressure is ________ L.

Accepted Answer

A) 38 
B) 19 
C) 2.2 
D) 0.053 
E) 0.026 
A) 38 
B) 19 
C) 2.2 
D) 0.053 
E) 0.026

Question 3

If pressure and temperature are kept constant,the reaction of 18 mL of N2 gas with 54 mL of H2 gas will form ________ mL of ammonia.

Accepted Answer

A) 108 
B) 18 
C) 9 
D) 36 
E) 27 
A) 108 
B) 18 
C) 9 
D) 36 
E) 27

Question 4

At a temperature of ________ °C,0.444 mol of CO gas occupies 11.8 L at 839 torr.

Accepted Answer

A) 379 
B) 73.0 
C) 14.0 
D) 32.0 
E) 83.5 
A) 379 
B) 73.0 
C) 14.0 
D) 32.0 
E) 83.5

Question 5

What is the total pressure (atm)in a 10.0 L vessel that contains 2.34 mol of carbon dioxide,1.73 mol of sulfur dioxide,and 4.50 mol of argon at standard temperature?

Accepted Answer

A) 192 
B) 1.92 
C) 0.192 
D) 19.2 
E) 0.0192 
A) 192 
B) 1.92 
C) 0.192 
D) 19.2 
E) 0.0192

Question 6

Since air is a mixture,it does not have a "molar mass." However,for calculation purposes,it is possible to speak of its "effective molar mass." (An effective molar mass is a weighted average of the molar masses of a mixture's components.)If air at STP has a density of 1.285 g/L,its effective molar mass is ________ g/mol.

Accepted Answer

A) 26.94 
B) 31.49 
C) 30.00 
D) 34.42 
E) 28.80 
A) 26.94 
B) 31.49 
C) 30.00 
D) 34.42 
E) 28.80

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

Question 8

The molecular weight of a gas is ________ g/mol if 3.5 g of the gas occupies 2.1 L at STP.

Accepted Answer

A) 41 
B) 5.5 × 103 
C) 37 
D) 4.6 × 102 
E) 2.7 × 10-2 
A) 41 
B) 5.5 × 103 
C) 37 
D) 4.6 × 102 
E) 2.7 × 10-2

Question 9

What is the rms speed (m/s)of N2 at 33.5 °C?

Accepted Answer

A) 173 
B) 51.9 
C) 302 
D) 522 
E) 16.5 
A) 173 
B) 51.9 
C) 302 
D) 522 
E) 16.5

Question 10

5.25 g of zinc metal reacts with excess sulfuric acid to produce hydrogen gas.What volume (L)of hydrogen is generated at STP?

Accepted Answer

A) 1.97 
B) 118 
C) 0.136 
D) 1.80 
E) 129 
A) 1.97 
B) 118 
C) 0.136 
D) 1.80 
E) 129

Question 11

The density of HCN is ________ g/L at STP.

Accepted Answer

A) 1.21 
B) 329 
C) 605 
D) 0.829 
E) 2.21 
A) 1.21 
B) 329 
C) 605 
D) 0.829 
E) 2.21

Question 12

A 5.50 L vessel contains 0.348 mol of methane,0.311 mol of propane,and 0.445 mol of neon at a total pressure of 882 mm Hg.What is the partial pressure (in mm Hg)of methane?

Accepted Answer

The answer of A 5.50 L vessel contains 0.348 mol...

Question 13

What is the density of (g/L)CO2 at 1.53 atm and 45.2 °C?

Accepted Answer

A) 18.2 
B) 2.58 
C) 0.388 
D) 9.99 
E) 1.76 
A) 18.2 
B) 2.58 
C) 0.388 
D) 9.99 
E) 1.76

Question 14

A pressure vessel contains CO2 (PCO2 = 3.78 atm)and O2 (PO2 = 6 atm)gases at a total pressure of 9.78 atm.What is the mole-fraction of CO2 and O2 gases,respectively?

Accepted Answer

A) 37, 58.7 
B) 0.61, 0.39 
C) 2.59, 1.63 
D) 0.39, 0.61 
E) 0.63, 1.59 
A) 37, 58.7 
B) 0.61, 0.39 
C) 2.59, 1.63 
D) 0.39, 0.61 
E) 0.63, 1.59

Question 15

A fixed amount of gas at 25.0 °C occupies a volume of 8.66 L when the pressure is 629 torr.Use Charles's law to calculate the volume (L)the gas will occupy when the temperature is increased to   while maintaining the pressure at 629 torr.

Accepted Answer

A) 9.26 
B) 11.2 
C) 1.93 
D) 6.70 
E) 38.8 
A) 9.26 
B) 11.2 
C) 1.93 
D) 6.70 
E) 38.8

Question 16

A 255 mL round-bottom flask is weighed and found to have a mass of 114.85 g.A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath.All of the liquid vaporizes at the boiling temperature of water,filling the flask with vapor.When all of the liquid has vaporized,the flask is removed from the bath,cooled,dried,and reweighed.The new mass of the flask and the condensed vapor is 115.23 g.Which of the following compounds could the liquid be? (Assume the ambient pressure is 1 atm.)

Accepted Answer

A) ethanol 
B) propanol 
C) butanol 
D) hexanol 
E) methanol 
A) ethanol 
B) propanol 
C) butanol 
D) hexanol 
E) methanol

Question 17

A sample of Ne gas (2.5 L)at 4.5 atm and 25 °C was combined with 2.2 L of Ar gas at 6.3 atm and 25 °C at constant temperature in a 8.0 L flask.Assuming the initial pressure in the flask was 0.00 atm and the temperature upon mixing was 25 °C,what is the total pressure (atm)in the flask?

Accepted Answer

A) 11.4 
B) 10.0 
C) 5.34 
D) 10.8 
E) 3.14 
A) 11.4 
B) 10.0 
C) 5.34 
D) 10.8 
E) 3.14

Question 18

A pressure of 0.500 atm is the same as a pressure of ________ of mm Hg.

Accepted Answer

A) 193 
B) 760. 
C) 380. 
D) 29.9 
E) 33.0 
A) 193 
B) 760. 
C) 380. 
D) 29.9 
E) 33.0

Question 19

A 0.325 L flask filled with gas at 0.851 atm and 19 °C contains ________ mol of gas.

Accepted Answer

A) 0.0116 
B) 0.0148 
C) 9.42 
D) 12.4 
E) 80.7 
A) 0.0116 
B) 0.0148 
C) 9.42 
D) 12.4 
E) 80.7

Question 20

What is the temperature at STP?

Accepted Answer

A) 0 °C 
B) 25 °C 
C) -32 °F 
D) 298 k 
E) 0 k 
A) 0 °C 
B) 25 °C 
C) -32 °F 
D) 298 k 
E) 0 k

Exam 10: Gases

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

The volume occupied by 1.5 mol of gas at 35 °C and 2.0 atm pressure is ________ L.

If pressure and temperature are kept constant,the reaction of 18 mL of N2 gas with 54 mL of H2 gas will form ________ mL of ammonia.

At a temperature of ________ °C,0.444 mol of CO gas occupies 11.8 L at 839 torr.

What is the total pressure (atm)in a 10.0 L vessel that contains 2.34 mol of carbon dioxide,1.73 mol of sulfur dioxide,and 4.50 mol of argon at standard temperature?

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 molecular weight of a gas is ________ g/mol if 3.5 g of the gas occupies 2.1 L at STP.

What is the rms speed (m/s)of N2 at 33.5 °C?

5.25 g of zinc metal reacts with excess sulfuric acid to produce hydrogen gas.What volume (L)of hydrogen is generated at STP?

The density of HCN is ________ g/L at STP.

A 5.50 L vessel contains 0.348 mol of methane,0.311 mol of propane,and 0.445 mol of neon at a total pressure of 882 mm Hg.What is the partial pressure (in mm Hg)of methane?

What is the density of (g/L)CO2 at 1.53 atm and 45.2 °C?

A pressure vessel contains CO2 (PCO2 = 3.78 atm)and O2 (PO2 = 6 atm)gases at a total pressure of 9.78 atm.What is the mole-fraction of CO2 and O2 gases,respectively?

A fixed amount of gas at 25.0 °C occupies a volume of 8.66 L when the pressure is 629 torr.Use Charles's law to calculate the volume (L)the gas will occupy when the temperature is increased to while maintaining the pressure at 629 torr.

A sample of Ne gas (2.5 L)at 4.5 atm and 25 °C was combined with 2.2 L of Ar gas at 6.3 atm and 25 °C at constant temperature in a 8.0 L flask.Assuming the initial pressure in the flask was 0.00 atm and the temperature upon mixing was 25 °C,what is the total pressure (atm)in the flask?

A pressure of 0.500 atm is the same as a pressure of ________ of mm Hg.

A 0.325 L flask filled with gas at 0.851 atm and 19 °C contains ________ mol of gas.

What is the temperature at STP?

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

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

If pressure and temperature are kept constant,the reaction of 18 mL of N₂ gas with 54 mL of H₂ gas will form ________ mL of ammonia.

What is the rms speed (m/s)of N₂ at 33.5 °C?

What is the density of (g/L)CO₂ at 1.53 atm and 45.2 °C?

A pressure vessel contains CO₂ (P_CO2 = 3.78 atm)and O₂ (P_O2 = 6 atm)gases at a total pressure of 9.78 atm.What is the mole-fraction of CO₂ and O₂ gases,respectively?