Question 1

The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

Accepted Answer

A) 127 
B) 1.15 
C) 878 
D) 24.4 
E) 12.7 
A) 127 
B) 1.15 
C) 878 
D) 24.4 
E) 12.7

Question 2

CO (5.00 g)and CO2 (5.00 g)were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

Accepted Answer

A) 6.29 
B) 4.02 
C) 10.3 
D) 0.292 
E) 1.60 
A) 6.29 
B) 4.02 
C) 10.3 
D) 0.292 
E) 1.60

Question 3

A sample of an unknown volatile liquid was injected into a Dumas flask (mflask = 27.0928 g, Vflask = 0.1040 L)and heated until no visible traces of the liquid could be found. The flask and its contents were then rapidly cooled and reweighed (mflask+vapor = 27.4593 g). The atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °C, respectively. The unknown volatile liquid was __________.

Accepted Answer

A) C6H12 
B) C6H14 
C) C7H14 
D) C7H16 
E) C6H6 
A) C6H12 
B) C6H14 
C) C7H14 
D) C7H16 
E) C6H6

Question 4

The reaction of 25 mL of N2 gas with 75 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 5

The rms speed of methane molecules at 45.0°C is __________ m/sec.

Accepted Answer

The answer of The rms speed of methane molecules at...

Question 6

How much faster does 235UF6 effuse than 238UF6?

Accepted Answer

A) 1.013 times as fast 
B) 1.009 times as fast 
C) 1.004 times as fast 
D) 1.006 times as fast 
E) 1.018 times as fast 
A) 1.013 times as fast 
B) 1.009 times as fast 
C) 1.004 times as fast 
D) 1.006 times as fast 
E) 1.018 times as fast

Question 7

A sample of gas (1.9 mol)is in a flask at 21°C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 782 mm Hg and the temperature is now 26°C. There are now __________ mol of gas in the flask.

Accepted Answer

A) 1.6 
B) 2.1 
C) 2.9 
D) 3.5 
E) 0.28 
A) 1.6 
B) 2.1 
C) 2.9 
D) 3.5 
E) 0.28

Question 8

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl2, O2, F2, N2

Accepted Answer

A) Cl2 2 2 2 
B) Cl2 2 2 2 
C) N2 2 2 2 
D) Cl2 2 2 2 
E) F2 2 2 2 
A) Cl2 2 2 2 
B) Cl2 2 2 2 
C) N2 2 2 2 
D) Cl2 2 2 2 
E) F2 2 2 2

Question 9

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.

Accepted Answer

A) 9.1 
B) 6.5 
C) 1.04 
D) 0.74 
E) 1.86 
A) 9.1 
B) 6.5 
C) 1.04 
D) 0.74 
E) 1.86

Question 10

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0°C and 4.31 atm is __________ mL.

Accepted Answer

A) 10.4 
B) 210 
C) 420 
D) 79.9 
E) 104 
A) 10.4 
B) 210 
C) 420 
D) 79.9 
E) 104

Question 11

The density of chlorine (Cl2)gas at 25°C and 60. kPa is __________ g/L.

Accepted Answer

A) 20 
B) 4.9 
C) 1.7 
D) 0.86 
E) 0.58 
A) 20 
B) 4.9 
C) 1.7 
D) 0.86 
E) 0.58

Question 12

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m2.

Accepted Answer

A) 1.8 × 103 
B) 59 
C) 2.4 × 105 
D) 0.018 
E) 2.4 
A) 1.8 × 103 
B) 59 
C) 2.4 × 105 
D) 0.018 
E) 2.4

Question 13

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 14

Calcium hydride (CaH2)reacts with water to form hydrogen gas: CaH2 (s)+ 2H2O (l)→ Ca(OH)2 (aq)+ 2H2 (g)
How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32°C?

Accepted Answer

A) 50.7 
B) 0.851 
C) 143 
D) 35.8 
E) 71.7 
A) 50.7 
B) 0.851 
C) 143 
D) 35.8 
E) 71.7

Question 15

The main component of air is oxygen.

Accepted Answer

A) True 
 B)False

Question 16

The root-mean-square speed of CO at 113°C is __________ m/s.

Accepted Answer

A) 317 
B) 58.3 
C) 586 
D) 993 
E) 31.5 
A) 317 
B) 58.3 
C) 586 
D) 993 
E) 31.5

Question 17

The volume occupied by 0.50 mol of gas at 35°C and 2.0 atm pressure is __________ L.

Accepted Answer

A) 38 
B) 6.3 
C) .72 
D) .053 
E) .026 
A) 38 
B) 6.3 
C) .72 
D) .053 
E) .026

Question 18

Given the equation:
C2H6 (g) + O2 (g)→ CO2 (g)+ H2O (g)(not balanced)
Determine the number of liters of CO2 formed at STP. when 240.0 grams of C2H6 is burned in excess oxygen gas.

Accepted Answer

Question 19

The density (in g/L)of CO2 at 1140 torr and 60.0°C is __________.

Accepted Answer

A) 2.42 
B) 16.2 
C) 5.70 
D) 44.0 
E) 10.9 
A) 2.42 
B) 16.2 
C) 5.70 
D) 44.0 
E) 10.9

Question 20

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

Accepted Answer

A) 0.179 
B) 0.238 
C) 0.357 
D) 0.583 
E) 0.417 
A) 0.179 
B) 0.238 
C) 0.357 
D) 0.583 
E) 0.417

Exam 10: Gases

The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

CO (5.00 g)and CO2 (5.00 g)were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

The reaction of 25 mL of N2 gas with 75 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.

The rms speed of methane molecules at 45.0°C is __________ m/sec.

How much faster does 235UF6 effuse than 238UF6?

A sample of gas (1.9 mol)is in a flask at 21°C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 782 mm Hg and the temperature is now 26°C. There are now __________ mol of gas in the flask.

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl2, O2, F2, N2

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0°C and 4.31 atm is __________ mL.

The density of chlorine (Cl2)gas at 25°C and 60. kPa is __________ g/L.

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m2.

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.

Calcium hydride (CaH2)reacts with water to form hydrogen gas: CaH2 (s)+ 2H2O (l)→ Ca(OH)2 (aq)+ 2H2 (g) How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32°C?

The main component of air is oxygen.

The root-mean-square speed of CO at 113°C is __________ m/s.

The volume occupied by 0.50 mol of gas at 35°C and 2.0 atm pressure is __________ L.

Given the equation: C2H6 (g) + O2 (g)→ CO2 (g)+ H2O (g)(not balanced) Determine the number of liters of CO2 formed at STP. when 240.0 grams of C2H6 is burned in excess oxygen gas.

The density (in g/L)of CO2 at 1140 torr and 60.0°C is __________.

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

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

CO (5.00 g)and CO₂ (5.00 g)were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

The reaction of 25 mL of N₂ gas with 75 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.

How much faster does 235UF₆ effuse than 238UF₆?

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl₂, O₂, F₂, N₂

The density of chlorine (Cl₂)gas at 25°C and 60. kPa is __________ g/L.

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m².

Calcium hydride (CaH₂)reacts with water to form hydrogen gas: CaH₂ (s)+ 2H₂O (l)→ Ca(OH)₂ (aq)+ 2H₂ (g) How many grams of CaH₂ are needed to generate 48.0 L of H₂ gas at a pressure of 0.888 atm and a temperature of 32°C?

Given the equation: C₂H₆(g₎ + O₂ (g)→ CO₂ (g)+ H₂O (g)(not balanced) Determine the number of liters of CO₂ formed at STP. when 240.0 grams of C₂H₆ is burned in excess oxygen gas.

The density (in g/L)of CO₂ at 1140 torr and 60.0°C is __________.