Question 1

A sample of N2 gas (2.0 mmol)effused through a pinhole in 5.5 s. It will take __________ s for the same amount of CH4 to effuse under the same conditions.

Accepted Answer

A) 7.3 
B) 5.5 
C) 3.1 
D) 4.2 
E) 9.6 
A) 7.3 
B) 5.5 
C) 3.1 
D) 4.2 
E) 9.6

Question 2

What is the partial pressure (in mm Hg)of neon in a 4.00 L vessel that contains 0.838 mol of methane, 0.184 mol of ethane, and 0.755 mol of neon at a total pressure of 928 mm Hg?

Accepted Answer

The answer of What is the partial pressure (in mm...

Question 3

The mass of nitrogen dioxide contained in a 4.32 L vessel at 48°C and 141600 Pa is __________ g.

Accepted Answer

A) 5.35 × 104 
B) 53.5 
C) 10.5 
D) 70.5 
E) 9.46 × 10-2 
A) 5.35 × 104 
B) 53.5 
C) 10.5 
D) 70.5 
E) 9.46 × 10-2

Question 4

The first person to investigate the relationship between the pressure of a gas and its volume was __________.

Accepted Answer

A) Amadeo Avogadro 
B) Lord Kelvin 
C) Jacques Charles 
D) Robert Boyle 
E) Joseph Louis Gay-Lussac 
A) Amadeo Avogadro 
B) Lord Kelvin 
C) Jacques Charles 
D) Robert Boyle 
E) Joseph Louis Gay-Lussac

Question 5

A sample of an ideal gas (3.00 L)in a closed container at 25.0°C and 76.0 torr is heated to 340°C. The pressure of the gas at this temperature is __________ torr.

Accepted Answer

A) 912 
B) 156 
C) 76.5 
D) 39.5 
E) 0.0253 
A) 912 
B) 156 
C) 76.5 
D) 39.5 
E) 0.0253

Question 6

A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 11.8 cm. Atmospheric pressure was 783 mm Hg. The pressure of the argon in the container was __________ mm Hg.

Accepted Answer

A) 118 
B) 661 
C) 771 
D) 795 
E) 882 
A) 118 
B) 661 
C) 771 
D) 795 
E) 882

Question 7

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) C4H10 
B) C3H7OH 
C) C2H6 
D) C2H5OH 
E) C4H9OH 
A) C4H10 
B) C3H7OH 
C) C2H6 
D) C2H5OH 
E) C4H9OH

Question 8

The reaction of 50 mL of N2 gas with 150 mL of H2 gas to form ammonia via the equation: N2 (g)+ 3H2 (g)→ 2NH3 (g)
Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Accepted Answer

A) 250 
B) 50 
C) 200 
D) 150 
E) 100 
A) 250 
B) 50 
C) 200 
D) 150 
E) 100

Question 9

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0°C and 1.00 atm. The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under these conditions will produce __________ L of CO2.

Accepted Answer

A) 1.09 × 102 
B) 2.85 × 104 
C) 1.82 × 104 
D) 8.70 × 102 
E) 1.82 × 103 
A) 1.09 × 102 
B) 2.85 × 104 
C) 1.82 × 104 
D) 8.70 × 102 
E) 1.82 × 103

Question 10

Which noble gas is expected to show the largest deviations from the ideal gas behavior?

Accepted Answer

A) helium 
B) neon 
C) argon 
D) krypton 
E) xenon 
A) helium 
B) neon 
C) argon 
D) krypton 
E) xenon

Question 11

What volume (mL)of sulfur dioxide can be produced by the complete reaction of 3.82 g of calcium sulfite with excess HCl (aq), when the final SO2 pressure is 827 torr at 44.0°C?

Accepted Answer

A) 7.60 x 102 
B) 1.39 × 10-4 
C) 1.00 × 10-3 
D) 0.106 
E) 5.78 × 102 
A) 7.60 x 102 
B) 1.39 × 10-4 
C) 1.00 × 10-3 
D) 0.106 
E) 5.78 × 102

Question 12

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100°C is __________ atm. (a = 0.211 L2-atm/mol2, b = 0.0171 L/mol)

Accepted Answer

A) 0.730 
B) 1.00 
C) 1.21 
D) 1.37 
E) 0.367 
A) 0.730 
B) 1.00 
C) 1.21 
D) 1.37 
E) 0.367

Question 13

What is the density (in g/L)of oxygen gas at 77.0°C and 700.0 torr?

Accepted Answer

The answer of What is the density (in g/L)of oxygen...

Question 14

Arrange the following gases in order of increasing average molecular speed at 25°C. He, O2, CO2, N2

Accepted Answer

A) He 2 2 2 
B) He 2 2 2 
C) CO2 2 2 2 2 2 2 2 2 
A) He 2 2 2 
B) He 2 2 2 
C) CO2 2 2 2 2 2 2 2 2

Question 15

How many molecules are there in 4.00 L of oxygen gas at 500 °C and 50.0 torr?

Accepted Answer

The answer of How many molecules are there in 4.00...

Question 16

Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas: NaH (s)+ H2O (l)→ NaOH (aq)+ H2 (g)
A sample of NaH weighing __________ g will produce 982 mL of gas at 28.0°C and 765 torr, when the hydrogen is collected over water. The vapor pressure of water at this temperature is 28 torr.

Accepted Answer

A) 2.93 
B) 0.960 
C) 0.925 
D) 0.0388 
E) 925 
A) 2.93 
B) 0.960 
C) 0.925 
D) 0.0388 
E) 925

Question 17

30.0 grams of argon and 15.0 grams of xenon are placed in a 120.0 ml container at 22.0°C. The partial pressure of xenon is __________ atm.

Accepted Answer

A) 8.70 
B) 22.9 
C) 0.700 
D) 174 
E) 5.60 
A) 8.70 
B) 22.9 
C) 0.700 
D) 174 
E) 5.60

Question 18

The density of NO2 in a 3.50 L tank at 780.0 torr and 37.0°C is __________ g/L.

Accepted Answer

A) 1.64 
B) 9.30 
C) 1.86 
D) 2.92 
E) 3.27 
A) 1.64 
B) 9.30 
C) 1.86 
D) 2.92 
E) 3.27

Question 19

A sample of oxygen gas (O2)was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.

Accepted Answer

A) 288 
B) 96 
C) 55 
D) 4 
E) 10.7 
A) 288 
B) 96 
C) 55 
D) 4 
E) 10.7

Question 20

The amount of gas that occupies 60.82 L at 31.0°C and 367 mm Hg is __________ mol.

Accepted Answer

A) 1.18 
B) 0.850 
C) 894 
D) 11.6 
E) 0.120 
A) 1.18 
B) 0.850 
C) 894 
D) 11.6 
E) 0.120

Exam 10: Gases

A sample of N2 gas (2.0 mmol)effused through a pinhole in 5.5 s. It will take __________ s for the same amount of CH4 to effuse under the same conditions.

What is the partial pressure (in mm Hg)of neon in a 4.00 L vessel that contains 0.838 mol of methane, 0.184 mol of ethane, and 0.755 mol of neon at a total pressure of 928 mm Hg?

The mass of nitrogen dioxide contained in a 4.32 L vessel at 48°C and 141600 Pa is __________ g.

The first person to investigate the relationship between the pressure of a gas and its volume was __________.

A sample of an ideal gas (3.00 L)in a closed container at 25.0°C and 76.0 torr is heated to 340°C. The pressure of the gas at this temperature is __________ torr.

A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 11.8 cm. Atmospheric pressure was 783 mm Hg. The pressure of the argon in the container was __________ mm Hg.

The reaction of 50 mL of N2 gas with 150 mL of H2 gas to form ammonia via the equation: N2 (g)+ 3H2 (g)→ 2NH3 (g) Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0°C and 1.00 atm. The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under these conditions will produce __________ L of CO2.

Which noble gas is expected to show the largest deviations from the ideal gas behavior?

What volume (mL)of sulfur dioxide can be produced by the complete reaction of 3.82 g of calcium sulfite with excess HCl (aq), when the final SO2 pressure is 827 torr at 44.0°C?

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100°C is __________ atm. (a = 0.211 L2-atm/mol2, b = 0.0171 L/mol)

What is the density (in g/L)of oxygen gas at 77.0°C and 700.0 torr?

Arrange the following gases in order of increasing average molecular speed at 25°C. He, O2, CO2, N2

How many molecules are there in 4.00 L of oxygen gas at 500 °C and 50.0 torr?

30.0 grams of argon and 15.0 grams of xenon are placed in a 120.0 ml container at 22.0°C. The partial pressure of xenon is __________ atm.

The density of NO2 in a 3.50 L tank at 780.0 torr and 37.0°C is __________ g/L.

A sample of oxygen gas (O2)was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.

The amount of gas that occupies 60.82 L at 31.0°C and 367 mm Hg is __________ mol.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

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

A sample of N₂ gas (2.0 mmol)effused through a pinhole in 5.5 s. It will take __________ s for the same amount of CH₄ to effuse under the same conditions.

The reaction of 50 mL of N₂ gas with 150 mL of H₂ gas to form ammonia via the equation: N₂ (g)+ 3H₂ (g)→ 2NH₃ (g) Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0°C and 1.00 atm. The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under these conditions will produce __________ L of CO₂.

What volume (mL)of sulfur dioxide can be produced by the complete reaction of 3.82 g of calcium sulfite with excess HCl (aq), when the final SO₂ pressure is 827 torr at 44.0°C?

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100°C is __________ atm. (a = 0.211 L²-atm/mol², b = 0.0171 L/mol)

Arrange the following gases in order of increasing average molecular speed at 25°C. He, O₂, CO₂, N₂

The density of NO₂ in a 3.50 L tank at 780.0 torr and 37.0°C is __________ g/L.

A sample of oxygen gas (O₂)was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.