Question 1

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?

Accepted Answer

A) 8 
B) 2 
C) 1/2 
D) 1/4 
E) 1/8 
A) 8 
B) 2 
C) 1/2 
D) 1/4 
E) 1/8 C

Question 2

Calculate the density, in g/L, of SF6 gas at 27°C and 0.500 atm pressure.

Accepted Answer

A) 3.38 * 10-3 g/L 
B) 2.96 g/L 
C) 22.4 g/L 
D) 32.9 g/L 
E) 3.38 kg/L 
A) 3.38 * 10-3 g/L 
B) 2.96 g/L 
C) 22.4 g/L 
D) 32.9 g/L 
E) 3.38 kg/L B

Question 3

Which of these properties is/are characteristic(s)of gases?

Accepted Answer

A) High compressibility 
B) Relatively large distances between molecules 
C) Formation of homogeneous mixtures regardless of the nature of gases 
D) A and B. 
E) A, B, and C. 
A) High compressibility 
B) Relatively large distances between molecules 
C) Formation of homogeneous mixtures regardless of the nature of gases 
D) A and B. 
E) A, B, and C. E

Question 4

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 5

Which of these gases will have the greatest density at the same specified temperature and pressure?

Accepted Answer

A) H2 
B) CClF3 
C) CO2 
D) C2H6 
E) CF4 
A) H2 
B) CClF3 
C) CO2 
D) C2H6 
E) CF4

Question 6

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 7

What is the definition of a "gas"?

Accepted Answer

A "gas" is a substance in whic

Question 8

Calculate the density, in g/L, of chlorine (Cl2)gas at STP.

Accepted Answer

A) 2.13 * 10-2 g/L 
B) 46.9 g/L 
C) 1.58 g/L 
D) 3.16 g/L 
E) 0.316 kg/L 
A) 2.13 * 10-2 g/L 
B) 46.9 g/L 
C) 1.58 g/L 
D) 3.16 g/L 
E) 0.316 kg/L

Question 9

Which statement is false?

Accepted Answer

A) The average kinetic energies of molecules from samples of different "ideal" gases is the same at the same temperature. 
B) The molecules of an ideal gas are relatively far apart. 
C) All molecules of an ideal gas have the same kinetic energy at constant temperature. 
D) Molecules of a gas undergo many collisions with each other and the container walls. 
E) Molecules of greater mass have a lower average speed than those of less mass at the same temperature. 
A) The average kinetic energies of molecules from samples of different "ideal" gases is the same at the same temperature. 
B) The molecules of an ideal gas are relatively far apart. 
C) All molecules of an ideal gas have the same kinetic energy at constant temperature. 
D) Molecules of a gas undergo many collisions with each other and the container walls. 
E) Molecules of greater mass have a lower average speed than those of less mass at the same temperature.

Question 10

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

Accepted Answer

A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question 
A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question

Question 11

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 12

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 13

Phosgene, a chemical warfare agent used in World War I, consists of 12.41% C, 16.17% O, and 71.69% Cl. 1.00 L of this gas at STP has a mass of 4.42 g. What is the molecular formula of phosgene?

Accepted Answer

The answer of Phosgene, a chemical warfare agent used in...

Question 14

What is T in the table below?

Accepted Answer

The answer of What is T in the table below?...

Question 15

At standard temperature and pressure, a given sample of water vapor occupies a volume of 2.80 L. How many moles of water vapor are present?

Accepted Answer

The answer of At standard temperature and pressure, a given...

Question 16

What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

Accepted Answer

A) 24.6 g 
B) 70.8 g 
C) 272 g 
D) 408 g 
E) 612 g 
A) 24.6 g 
B) 70.8 g 
C) 272 g 
D) 408 g 
E) 612 g

Question 17

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 18

What is the pressure of the gas trapped in the apparatus shown below when the atmospheric pressure is 720 mmHg?

Accepted Answer

A) 12 mmHg 
B) 708 mmHg 
C) 720 mmHg 
D) 732 mmHg 
E) 760 mmHg 
A) 12 mmHg 
B) 708 mmHg 
C) 720 mmHg 
D) 732 mmHg 
E) 760 mmHg

Question 19

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved. Calculate the volume of H2(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Accepted Answer

A) 3.4 * 10-3 L 
B) 2.2 L 
C) 2.9 L 
D) 5.8 L 
E) 11.7 L 
A) 3.4 * 10-3 L 
B) 2.2 L 
C) 2.9 L 
D) 5.8 L 
E) 11.7 L

Question 20

Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97°C. The pressure of the chloroform is 728 mmHg.

Accepted Answer

A) 187 g/mol 
B) 121 g/mol 
C) 112 g/mol 
D) 31.6 g/mol 
E) 8.28 * 10-3 g/mol 
A) 187 g/mol 
B) 121 g/mol 
C) 112 g/mol 
D) 31.6 g/mol 
E) 8.28 * 10-3 g/mol

Exam 5: Gases

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?

Calculate the density, in g/L, of SF6 gas at 27°C and 0.500 atm pressure.

Which of these properties is/are characteristic(s)of gases?

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)

Which of these gases will have the greatest density at the same specified temperature and pressure?

What is the definition of a "gas"?

Calculate the density, in g/L, of chlorine (Cl2)gas at STP.

Which statement is false?

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

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?

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

Phosgene, a chemical warfare agent used in World War I, consists of 12.41% C, 16.17% O, and 71.69% Cl. 1.00 L of this gas at STP has a mass of 4.42 g. What is the molecular formula of phosgene?

What is T in the table below?

At standard temperature and pressure, a given sample of water vapor occupies a volume of 2.80 L. How many moles of water vapor are present?

What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

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 is the pressure of the gas trapped in the apparatus shown below when the atmospheric pressure is 720 mmHg?

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved. Calculate the volume of H2(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97°C. The pressure of the chloroform is 728 mmHg.

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

Calculate the density, in g/L, of SF₆ gas at 27°C and 0.500 atm pressure.

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, in g/L, of chlorine (Cl₂)gas at STP.

What mass of KClO₃ must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

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.)

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved. Calculate the volume of H₂(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm³ at 97°C. The pressure of the chloroform is 728 mmHg.