Question 1

Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.

Accepted Answer

The answer of Calculate the molar mass of a gaseous...

Question 2

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

Accepted Answer

A) 1.00 * 102 ft 
B) 18.8 mm 
C) 33.8 ft 
D) 76.0 cm 
E) 348 cm 
A) 1.00 * 102 ft 
B) 18.8 mm 
C) 33.8 ft 
D) 76.0 cm 
E) 348 cm

Question 3

Calculate the volume occupied by 35.2 g of methane gas (CH4)at 25°C and 1.0 atm. R = 0.08206 L3atm/K3mol.

Accepted Answer

A) 0.0186 L 
B) 4.5 L 
C) 11.2 L 
D) 49.2 L 
E) 53.7 L 
A) 0.0186 L 
B) 4.5 L 
C) 11.2 L 
D) 49.2 L 
E) 53.7 L

Question 4

The temperature of an ideal gas in a 5.00 L container originally at 1 atm pressure and 25°C is lowered to 220 K. Calculate the new pressure of the gas.

Accepted Answer

A) 1.0 atm 
B) 1.35 atm 
C) 8.8 atm 
D) 0.738 atm 
E) 0.114 atm 
A) 1.0 atm 
B) 1.35 atm 
C) 8.8 atm 
D) 0.738 atm 
E) 0.114 atm

Question 5

The molecules of different samples of an ideal gas have the same average kinetic energies, at the same

Accepted Answer

A) pressure. 
B) temperature. 
C) volume. 
D) density. 
A) pressure. 
B) temperature. 
C) volume. 
D) density.

Question 6

The gas pressure in an aerosol can is 1.8 atm at 25°C. If the gas is an ideal gas, what pressure would develop in the can if it were heated to 475°C?

Accepted Answer

A) 0.095 atm 
B) 0.717 atm 
C) 3.26 atm 
D) 4.52 atm 
E) 34.2 atm 
A) 0.095 atm 
B) 0.717 atm 
C) 3.26 atm 
D) 4.52 atm 
E) 34.2 atm

Question 7

A method of removing CO2 from a spacecraft is to allow the CO2 to react with sodium hydroxide. (The products of the reaction are sodium carbonate and water.)What volume of carbon dioxide at 25°C and 749 mmHg can be removed per kilogram of sodium hydroxide that reacts?

Accepted Answer

A) 301 L 
B) 284 L 
C) 276 L 
D) 310 L 
E) 620 L 
A) 301 L 
B) 284 L 
C) 276 L 
D) 310 L 
E) 620 L

Question 8

A gas-filled balloon with a volume of 12.5 L at 0.90 atm and 21°C is allowed to rise to the stratosphere where the temperature is -5°C and the pressure is 1.0 millibar. What is the final volume of the balloon? 1.000 atm = 1.013 bar.

Accepted Answer

1.0 * 10<s

Question 9

Deviations from the ideal gas law are greater at

Accepted Answer

A) low temperatures and low pressures. 
B) low temperatures and high pressures. 
C) high temperatures and high pressures. 
D) high temperatures and low pressures. 
A) low temperatures and low pressures. 
B) low temperatures and high pressures. 
C) high temperatures and high pressures. 
D) high temperatures and low pressures.

Question 10

A block of dry ice (solid CO2, density = 1.56 g/mL)of dimensions 25.0 cm * 25.0 cm * 25.0 cm is left to sublime (i.e. to pass from the solid phase to the gas phase)in a closed chamber of dimensions 4.00 m * 5.00 m * 3.00 m. The partial pressure of carbon dioxide in this chamber at 25°C will be

Accepted Answer

A) 171 mmHg. 
B) 107 mmHg. 
C) 0.225 mmHg. 
D) 0.171 mmHg. 
E) 14.4 mmHg. 
A) 171 mmHg. 
B) 107 mmHg. 
C) 0.225 mmHg. 
D) 0.171 mmHg. 
E) 14.4 mmHg.

Question 11

Calculate the mass, in grams, of 2.74 L of CO gas measured at 33°C and 945 mmHg.

Accepted Answer

A) 0.263 g 
B) 2.46 g 
C) 3.80 g 
D) 35.2 g 
E) 206 g 
A) 0.263 g 
B) 2.46 g 
C) 3.80 g 
D) 35.2 g 
E) 206 g

Question 12

How many grams of N2O, nitrous oxide, are contained in 500. mL of the gas at STP?

Accepted Answer

Question 13

Gasoline (which can be considered to be octane, C8H18)burns in oxygen to produce carbon dioxide and water. What volume of oxygen at STP is necessary to react with 1.0 gal of gasoline?
(The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

Accepted Answer

Question 14

What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?

Accepted Answer

A) 0.274 g/mol 
B) 3.64 g/mol 
C) 78.2 g/mol 
D) 137 g/mol 
E) 365 g/mol 
A) 0.274 g/mol 
B) 3.64 g/mol 
C) 78.2 g/mol 
D) 137 g/mol 
E) 365 g/mol

Question 15

Air contains 78% N2, 21% O2, and 1% Ar, by volume. What is the density of air at 1,000. torr and -10°C?

Accepted Answer

A) 1.0 g/L 
B) 6.1 g/L 
C) 1.3 g/L 
D) 1.8 g/L 
E) 0.56 g/L 
A) 1.0 g/L 
B) 6.1 g/L 
C) 1.3 g/L 
D) 1.8 g/L 
E) 0.56 g/L

Question 16

At what temperature will a fixed amount of gas with a volume of 175 L at 15°C and 760 mmHg occupy a volume of 198 L at a pressure of 640 mm Hg?

Accepted Answer

A) 274°C 
B) 214°C 
C) 114°C 
D) 1°C 
E) -59°C 
A) 274°C 
B) 214°C 
C) 114°C 
D) 1°C 
E) -59°C

Question 17

The pressure of a gas sample was measured to be 654 mmHg. What is the pressure in kPa? (1 atm = 1.01325 * 105 Pa)

Accepted Answer

A) 87.2 kPa 
B) 118 kPa 
C) 6.63 * 104 kPa 
D) 8.72 * 104 kPa 
E) 8.72 * 107 kPa 
A) 87.2 kPa 
B) 118 kPa 
C) 6.63 * 104 kPa 
D) 8.72 * 104 kPa 
E) 8.72 * 107 kPa

Question 18

Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100. cm3 at 95°C, and 1,000. mmHg.

Accepted Answer

A) 0.19 g/mol 
B) 35.3 g/mol 
C) 70.9 g/mol 
D) 137 g/mol 
E) 384 g/mol 
A) 0.19 g/mol 
B) 35.3 g/mol 
C) 70.9 g/mol 
D) 137 g/mol 
E) 384 g/mol

Question 19

What is the significance of the magnitude of the van der Waals "a" constant?

Accepted Answer

The magnitude of the van der W

Question 20

Calculate the density of CO2(g)at 100°C and 10.0 atm pressure.

Accepted Answer

A) 1.44 g/L 
B) 134 g/L 
C) 44.0 g/L 
D) 53.6 g/L 
E) 14.4 g/L 
A) 1.44 g/L 
B) 134 g/L 
C) 44.0 g/L 
D) 53.6 g/L 
E) 14.4 g/L

Exam 5: Gases

Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

Calculate the volume occupied by 35.2 g of methane gas (CH4)at 25°C and 1.0 atm. R = 0.08206 L3atm/K3mol.

The temperature of an ideal gas in a 5.00 L container originally at 1 atm pressure and 25°C is lowered to 220 K. Calculate the new pressure of the gas.

The molecules of different samples of an ideal gas have the same average kinetic energies, at the same

The gas pressure in an aerosol can is 1.8 atm at 25°C. If the gas is an ideal gas, what pressure would develop in the can if it were heated to 475°C?

A method of removing CO2 from a spacecraft is to allow the CO2 to react with sodium hydroxide. (The products of the reaction are sodium carbonate and water.)What volume of carbon dioxide at 25°C and 749 mmHg can be removed per kilogram of sodium hydroxide that reacts?

A gas-filled balloon with a volume of 12.5 L at 0.90 atm and 21°C is allowed to rise to the stratosphere where the temperature is -5°C and the pressure is 1.0 millibar. What is the final volume of the balloon? 1.000 atm = 1.013 bar.

Deviations from the ideal gas law are greater at

A block of dry ice (solid CO2, density = 1.56 g/mL)of dimensions 25.0 cm * 25.0 cm * 25.0 cm is left to sublime (i.e. to pass from the solid phase to the gas phase)in a closed chamber of dimensions 4.00 m * 5.00 m * 3.00 m. The partial pressure of carbon dioxide in this chamber at 25°C will be

Calculate the mass, in grams, of 2.74 L of CO gas measured at 33°C and 945 mmHg.

How many grams of N2O, nitrous oxide, are contained in 500. mL of the gas at STP?

Gasoline (which can be considered to be octane, C8H18)burns in oxygen to produce carbon dioxide and water. What volume of oxygen at STP is necessary to react with 1.0 gal of gasoline? (The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?

Air contains 78% N2, 21% O2, and 1% Ar, by volume. What is the density of air at 1,000. torr and -10°C?

At what temperature will a fixed amount of gas with a volume of 175 L at 15°C and 760 mmHg occupy a volume of 198 L at a pressure of 640 mm Hg?

The pressure of a gas sample was measured to be 654 mmHg. What is the pressure in kPa? (1 atm = 1.01325 * 105 Pa)

Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100. cm3 at 95°C, and 1,000. mmHg.

What is the significance of the magnitude of the van der Waals "a" constant?

Calculate the density of CO2(g)at 100°C and 10.0 atm pressure.

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm³; the density of water is 1.00 g/cm³.

Calculate the volume occupied by 35.2 g of methane gas (CH₄)at 25°C and 1.0 atm. R = 0.08206 L3atm/K3mol.

A method of removing CO₂ from a spacecraft is to allow the CO₂ to react with sodium hydroxide. (The products of the reaction are sodium carbonate and water.)What volume of carbon dioxide at 25°C and 749 mmHg can be removed per kilogram of sodium hydroxide that reacts?

A block of dry ice (solid CO₂, density = 1.56 g/mL)of dimensions 25.0 cm * 25.0 cm * 25.0 cm is left to sublime (i.e. to pass from the solid phase to the gas phase)in a closed chamber of dimensions 4.00 m * 5.00 m * 3.00 m. The partial pressure of carbon dioxide in this chamber at 25°C will be

How many grams of N₂O, nitrous oxide, are contained in 500. mL of the gas at STP?

Gasoline (which can be considered to be octane, C₈H₁₈)burns in oxygen to produce carbon dioxide and water. What volume of oxygen at STP is necessary to react with 1.0 gal of gasoline? (The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

Air contains 78% N₂, 21% O₂, and 1% Ar, by volume. What is the density of air at 1,000. torr and -10°C?

The pressure of a gas sample was measured to be 654 mmHg. What is the pressure in kPa? (1 atm = 1.01325 * 10⁵ Pa)

Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100. cm³ at 95°C, and 1,000. mmHg.

Calculate the density of CO₂(g)at 100°C and 10.0 atm pressure.