Question 1

Calculate the density, in g/L, of CO2 gas at 27°C and 0.50 atm pressure.

Accepted Answer

A) 0.89 g/L 
B) 1.12 g/L 
C) 9.93 g/L 
D) 46.0 g/L 
E) 2.17 kg/L 
A) 0.89 g/L 
B) 1.12 g/L 
C) 9.93 g/L 
D) 46.0 g/L 
E) 2.17 kg/L

Question 2

If the pressure on a gas sample is tripled and the absolute temperature is quadrupled, by what factor will the volume of the sample change?

Accepted Answer

A) 12 
B) 4/3 
C) 3/4 
D) 1/3 
E) 4 
A) 12 
B) 4/3 
C) 3/4 
D) 1/3 
E) 4

Question 3

Calculate the density of Br2(g)at 59.0°C and 1.00 atm pressure.

Accepted Answer

A) 27.2 g/L 
B) 5.83 g/L 
C) 769 g/L 
D) 22.4 g/L 
E) 3.45 g/L 
A) 27.2 g/L 
B) 5.83 g/L 
C) 769 g/L 
D) 22.4 g/L 
E) 3.45 g/L

Question 4

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 5

Liquid nitrogen has a density of 0.807 g/mL at -195.8 °C.If 1.00 L of N2(l)is allowed to warm to 25°C at a pressure of 1.0 atm, what volume will the gas occupy? (R = 0.08206 L.atm/K.mol)

Accepted Answer

A) 59.1 L 
B) 182 L 
C) 705 L 
D) 1.41 * 103 L 
E) 1.97 * 104 L 
A) 59.1 L 
B) 182 L 
C) 705 L 
D) 1.41 * 103 L 
E) 1.97 * 104 L

Question 6

Give five examples of compounds that exist as gases at room temperature and pressure.

Accepted Answer

(Answers will vary.)

Question 7

For a substance that remains a gas under the conditions listed, deviation from the ideal gas law would be most pronounced at

Accepted Answer

A) 100°C and 2.0 atm. 
B) 0°C and 2.0 atm. 
C) -100°C and 2.0 atm. 
D) -100°C and 4.0 atm. 
E) 100°C and 4.0 atm. 
A) 100°C and 2.0 atm. 
B) 0°C and 2.0 atm. 
C) -100°C and 2.0 atm. 
D) -100°C and 4.0 atm. 
E) 100°C and 4.0 atm.

Question 8

A sample of nitrogen gas has a volume of 32.4 L at 20°C. The gas is heated to 220ºC at constant pressure. What is the final volume of nitrogen?

Accepted Answer

A) 2.94 L 
B) 19.3 L 
C) 31.4 L 
D) 54.5 L 
E) 356 L 
A) 2.94 L 
B) 19.3 L 
C) 31.4 L 
D) 54.5 L 
E) 356 L

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 gas evolved during the fermentation of sugar was collected.After purification its volume was found to be 25.0 L at 22.5°C and 702 mmHg.How many moles of gas were collected?

Accepted Answer

A) 0.95 mol 
B) 1.05 mol 
C) 12.5 mol 
D) 22.4 mol 
E) 724 mol 
A) 0.95 mol 
B) 1.05 mol 
C) 12.5 mol 
D) 22.4 mol 
E) 724 mol

Question 11

How many liters of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2 with excess HCl(aq)according to the following chemical equation? MnO2(s)+ 4HCl(aq)$\rarr$MnCl2(aq)+ 2H2O(l)+ Cl2(g)

Accepted Answer

A) 5.36 * 10-3 L 
B) 0.138 L 
C) 0.282 L 
D) 3.09 L 
E) 3.55 L 
A) 5.36 * 10-3 L 
B) 0.138 L 
C) 0.282 L 
D) 3.09 L 
E) 3.55 L

Question 12

Calculate the density of Ar(g)at -11°C and 675 mmHg.

Accepted Answer

A) 1.52 g/L 
B) 1.65 g/L 
C) -39.3 g/L 
D) 39.95 g/L 
E) 1254 g/L 
A) 1.52 g/L 
B) 1.65 g/L 
C) -39.3 g/L 
D) 39.95 g/L 
E) 1254 g/L

Question 13

How many liters of oxygen gas at 153°C and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO3? (The other decomposition product is solid potassium chloride.)

Accepted Answer

A) 3.0 L 
B) 0.085 L 
C) 4.20 L 
D) 7.79 L 
E) 11.7 L 
A) 3.0 L 
B) 0.085 L 
C) 4.20 L 
D) 7.79 L 
E) 11.7 L

Question 14

What volume of oxygen gas at 320 K and 680 torr will react completely with 2.50 L of NO gas at the same temperature and pressure? 2NO(g)+ O2(g)$\rarr$2NO2(g)

Accepted Answer

A) 1.25 L 
B) 2.50 L 
C) 3.00 L 
D) 1.00 L 
E) 5.00 L 
A) 1.25 L 
B) 2.50 L 
C) 3.00 L 
D) 1.00 L 
E) 5.00 L

Question 15

Today is a beautiful day for a picnic in the mountains, so we seal our peanut butter sandwich in a plastic sandwich bag at the base of the mountain.The approximate volume of the sandwich bag not occupied by the sandwich is 200.mL.The pressure at the base of the mountain is 1.0 atm.If the pressure at the top of the mountain is 0.80 atm, what is the final volume of gas in our sandwich bag?

Accepted Answer

The answer of Today is a beautiful day for a...

Question 16

Which gas has molecules with the greatest average molecular speed at 25°C?

Accepted Answer

A) CH4 
B) Kr 
C) N2 
D) CO2 
E) Ar 
A) CH4 
B) Kr 
C) N2 
D) CO2 
E) Ar

Question 17

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 18

Two moles of chlorine gas at 20.0°C are heated to 350°C while the volume is kept constant.The density of the gas

Accepted Answer

A) increases. 
B) decreases. 
C) remains the same. 
D) Not enough information is given to correctly answer the question. 
A) increases. 
B) decreases. 
C) remains the same. 
D) Not enough information is given to correctly answer the question.

Question 19

A 1.2 L flask contains 0.500 mole of ammonia (NH3)at 150°C. Calculate the pressure of the ammonia inside the flask.

Accepted Answer

A) 6.91 * 10-2 atm 
B) 5.13 atm 
C) 12.2 atm 
D) 14.5 atm 
E) 22.4 atm 
A) 6.91 * 10-2 atm 
B) 5.13 atm 
C) 12.2 atm 
D) 14.5 atm 
E) 22.4 atm

Question 20

A sample of mercury(II)oxide is placed in a 5.00 L evacuated container and heated until it decomposes entirely to mercury metal and oxygen gas. The container is then cooled to 25°C. One now finds that the gas pressure inside the container is 1.73 atm. What mass of mercury(II)oxide was originally placed into the container?

Accepted Answer

A) 913 g 
B) 76.6 g 
C) 1.51 g 
D) 45.6 g 
E) 153 g 
A) 913 g 
B) 76.6 g 
C) 1.51 g 
D) 45.6 g 
E) 153 g

Exam 5: Gases

Calculate the density, in g/L, of CO2 gas at 27°C and 0.50 atm pressure.

If the pressure on a gas sample is tripled and the absolute temperature is quadrupled, by what factor will the volume of the sample change?

Calculate the density of Br2(g)at 59.0°C and 1.00 atm pressure.

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

Liquid nitrogen has a density of 0.807 g/mL at -195.8 °C.If 1.00 L of N2(l)is allowed to warm to 25°C at a pressure of 1.0 atm, what volume will the gas occupy? (R = 0.08206 L.atm/K.mol)

Give five examples of compounds that exist as gases at room temperature and pressure.

For a substance that remains a gas under the conditions listed, deviation from the ideal gas law would be most pronounced at

A sample of nitrogen gas has a volume of 32.4 L at 20°C. The gas is heated to 220ºC at constant pressure. What is the final volume of nitrogen?

Deviations from the ideal gas law are greater at

A gas evolved during the fermentation of sugar was collected.After purification its volume was found to be 25.0 L at 22.5°C and 702 mmHg.How many moles of gas were collected?

How many liters of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2 with excess HCl(aq)according to the following chemical equation? MnO2(s)+ 4HCl(aq) →\rarr→ MnCl2(aq)+ 2H2O(l)+ Cl2(g)

Calculate the density of Ar(g)at -11°C and 675 mmHg.

How many liters of oxygen gas at 153°C and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO3? (The other decomposition product is solid potassium chloride.)

What volume of oxygen gas at 320 K and 680 torr will react completely with 2.50 L of NO gas at the same temperature and pressure? 2NO(g)+ O2(g) →\rarr→ 2NO2(g)

Which gas has molecules with the greatest average molecular speed at 25°C?

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

Two moles of chlorine gas at 20.0°C are heated to 350°C while the volume is kept constant.The density of the gas

A 1.2 L flask contains 0.500 mole of ammonia (NH3)at 150°C. Calculate the pressure of the ammonia inside the flask.

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Calculate the density, in g/L, of CO₂ gas at 27°C and 0.50 atm pressure.

Calculate the density of Br₂(g)at 59.0°C and 1.00 atm pressure.

Liquid nitrogen has a density of 0.807 g/mL at -195.8 °C.If 1.00 L of N₂(l)is allowed to warm to 25°C at a pressure of 1.0 atm, what volume will the gas occupy? (R = 0.08206 L.atm/K.mol)

How many liters of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO₂ with excess HCl(aq)according to the following chemical equation? MnO₂(s)+ 4HCl(aq) $\rarr$ MnCl₂(aq)+ 2H₂O(l)+ Cl₂(g)

How many liters of oxygen gas at 153°C and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO₃? (The other decomposition product is solid potassium chloride.)

What volume of oxygen gas at 320 K and 680 torr will react completely with 2.50 L of NO gas at the same temperature and pressure? 2NO(g)+ O₂(g) $\rarr$ 2NO₂(g)

A 1.2 L flask contains 0.500 mole of ammonia (NH₃)at 150°C. Calculate the pressure of the ammonia inside the flask.