Question 1

A balloon with volume 750 cm3 is filled with O2 at 27 °C has a mass of 83.3 g.The mass of empty balloon is 82.1 g.Calculate the pressure of O2.

Accepted Answer

A) 125 kPa 
B) 150 kPa 
C) 250 kPa 
D) 75 kPa 
E) 400 kPa 
A) 125 kPa 
B) 150 kPa 
C) 250 kPa 
D) 75 kPa 
E) 400 kPa

Question 2

A gaseous mixture consists of 50.0% O2,25.0% N2,and 25.0% Cl2,by mass.At standard temperature and pressure,the partial pressure of:

Accepted Answer

A) Cl2(g)is greater than 0.25 atm 
B) O2(g)is equal to 380 torr 
C) Cl2(g)is less than 0.25 atm 
D) N2(g)is equal to 0.20 atm 
E) O2(g)is equal to 1.6 atm 
A) Cl2(g)is greater than 0.25 atm 
B) O2(g)is equal to 380 torr 
C) Cl2(g)is less than 0.25 atm 
D) N2(g)is equal to 0.20 atm 
E) O2(g)is equal to 1.6 atm

Question 3

What is the ratio of the diffusion rates of Cl2 and O2? 
(Rate)Cl2/ (Rate)O2 =

Accepted Answer

A) 0.45 
B) 0.69 
C) 0.47 
D) 1.5 
E) 0.67 
A) 0.45 
B) 0.69 
C) 0.47 
D) 1.5 
E) 0.67

Question 4

Calculate the height of a column of liquid glycerol (d = 1.26 g/cm3),in meters,required to exert the same pressure as 4.91 m of water.

Accepted Answer

A) 4.91 m 
B) 3.90 m 
C) 6.19 m 
D) 3.65 m 
E) 5.16 m 
A) 4.91 m 
B) 3.90 m 
C) 6.19 m 
D) 3.65 m 
E) 5.16 m

Question 5

The energy of molecules of a gas:

Accepted Answer

A) is dependent on concentration 
B) is distributed over a wide range at constant temperature 
C) is the same for all molecules at constant temperature 
D) increases with a decrease in temperature 
E) increases with an increase in pressure 
A) is dependent on concentration 
B) is distributed over a wide range at constant temperature 
C) is the same for all molecules at constant temperature 
D) increases with a decrease in temperature 
E) increases with an increase in pressure

Question 6

If a liter of CO2 is compared to a liter of H2,both at 25 °C and one atmosphere pressure,then:

Accepted Answer

A) the CO2 and H2 molecules have the same average speed 
B) there are more H2 molecules than CO2 molecules 
C) the average kinetic energy of the CO2 molecules is greater than that of the H2 molecules 
D) the CO2 molecules are,on the average,moving more slowly than the H2 molecules 
E) the mass of one liter of CO2 equals the mass of one liter of H2  
A) the CO2 and H2 molecules have the same average speed 
B) there are more H2 molecules than CO2 molecules 
C) the average kinetic energy of the CO2 molecules is greater than that of the H2 molecules 
D) the CO2 molecules are,on the average,moving more slowly than the H2 molecules 
E) the mass of one liter of CO2 equals the mass of one liter of H2

Question 7

In the reaction  
How many moles of iron can be produced using 17.4 liters of hydrogen at STP?

Accepted Answer

A) (17.4/22.4)(2/3)mol 
B) (17.4/22.4)(3/2)mol 
C) (17.4)(2/3)mol 
D) (17.4/22.4)mol 
E) (17.4)(22.4/3)mol 
A) (17.4/22.4)(2/3)mol 
B) (17.4/22.4)(3/2)mol 
C) (17.4)(2/3)mol 
D) (17.4/22.4)mol 
E) (17.4)(22.4/3)mol

Question 8

In the reaction  
How many liters of O2 react with 5.0 liters of CH4? All gas volumes are measured at the same temperature and pressure but not at STP.

Accepted Answer

A) 0.22 L 
B) 10 L 
C) 5.0 L 
D) 2.5 L 
E) 20 L 
A) 0.22 L 
B) 10 L 
C) 5.0 L 
D) 2.5 L 
E) 20 L

Question 9

A 1.37 L vessel contains He at a temperature of 24.5 °C and a pressure of 205 mmHg.A 721 mL vessel contains Ne at a temperature of 36.2 °C and a pressure of 0.185 atm.Both of these gases are placed in a 2.00 L vessel at 302 K.What is the final pressure (in atm)in the 2.00 L vessel?

Accepted Answer

A) 0.253 atm 
B) 0.187 atm 
C) 0.0657 atm 
D) 0.455 atm 
E) 0.390 atm 
A) 0.253 atm 
B) 0.187 atm 
C) 0.0657 atm 
D) 0.455 atm 
E) 0.390 atm

Question 10

According to the kinetic-molecular theory of gases,at constant temperature,all particles have equal translational kinetic energy.

Accepted Answer

A) True 
 B)False

Question 11

Under conditions for which chlorine gas has an effusion rate of 2.4 × 10-6 mol/sec,what would be the effusion rate for bromine gas,in mol/sec?

Accepted Answer

A) 1.1 × 10-6 mol/sec 
B) 1.6 × 10-6 mol/sec 
C) 2.3 × 10-6 mol/sec 
D) 3.6 × 10-6 mol/sec 
E) 5.4 × 10-6 mol/sec 
A) 1.1 × 10-6 mol/sec 
B) 1.6 × 10-6 mol/sec 
C) 2.3 × 10-6 mol/sec 
D) 3.6 × 10-6 mol/sec 
E) 5.4 × 10-6 mol/sec

Question 12

In a sample of air at STP,the ratio of the root-mean-square velocity of O2 to that of N2,that is urms(O2)/urms(N2),is equal to ________.

Accepted Answer

A) 0.88 
B) 0.94 
C) 1.00 
D) 1.07 
E) 1.14 
A) 0.88 
B) 0.94 
C) 1.00 
D) 1.07 
E) 1.14

Question 13

If 250.L of nitrogen reacts with 582 L of hydrogen by the reaction:
N2(g)+ 3 H2(g)→ 2 NH3(g),
How much nitrogen is unreacted? All gases are at the same temperature and pressure.

Accepted Answer

A) 1.9 × 102 L 
B) 3.3 × 102 L 
C) 56 L 
D) 3.0 × 102 L 
E) 41 L 
A) 1.9 × 102 L 
B) 3.3 × 102 L 
C) 56 L 
D) 3.0 × 102 L 
E) 41 L

Question 14

Three volumes of O2 and one volume of CH4 are placed in a sealed container.The temperature and pressure of this mixture are 120 °C and 600 kPa.What is the pressure in the same container after the explosion of the mixture and after it was cooled to the initial temperature?

Accepted Answer

A) 350 kPa 
B) 600 kPa 
C) 950 kPa 
D) 750 kPa 
E) 575 kPa 
A) 350 kPa 
B) 600 kPa 
C) 950 kPa 
D) 750 kPa 
E) 575 kPa

Question 15

Convert 780 Torr to the equivalent pressure in atmospheres.

Accepted Answer

A) 0.974 atm 
B) 1.03 atm 
C) 20 atm 
D) 5.93 × 105 atm 
E) 5.85 atm 
A) 0.974 atm 
B) 1.03 atm 
C) 20 atm 
D) 5.93 × 105 atm 
E) 5.85 atm

Question 16

If someone were to light a cigar at one end of a closed room,persons at the other end of the room might soon perceive an odor due to gaseous emissions from the cigar.Such a phenomenon is an example of:

Accepted Answer

A) monometry 
B) ideality 
C) effusion 
D) diffusion 
E) barometry 
A) monometry 
B) ideality 
C) effusion 
D) diffusion 
E) barometry

Question 17

Subtracting the vapor pressure of water from the total pressure of a gas collected over water is an example of the application of:

Accepted Answer

A) Avogadro's Hypothesis 
B) Dalton's Law 
C) Graham's Law 
D) van der Waals Theory 
E) ideal gas law 
A) Avogadro's Hypothesis 
B) Dalton's Law 
C) Graham's Law 
D) van der Waals Theory 
E) ideal gas law

Question 18

Phosphine gas oxidizes spontaneously on exposure to air,as represented by:
2 PH3(g)+ 3 O2(g)→ P2O3(s)+ 3 H2O(g)
What volume of oxygen gas,at 720 Torr and 37 °C,would be consumed in the formation of 22.0 g of P2O3 by this process?

Accepted Answer

A) 16.1 L 
B) 12.5 L 
C) 11.2 L 
D) 8.05 L 
E) 1.92 L 
A) 16.1 L 
B) 12.5 L 
C) 11.2 L 
D) 8.05 L 
E) 1.92 L

Question 19

The ideal gas equation connects three basic variables: volume,amount,and temperature of a gas.

Accepted Answer

A) True 
 B)False

Question 20

A 10.0 L container of unknown gas at 25.0 °C contains 87.1 g of gas at 12.5 atm.What gas is in the container?

Accepted Answer

A) NH3 
B) C2H2 
C) SO2 
D) F2 
E) NO2 
A) NH3 
B) C2H2 
C) SO2 
D) F2 
E) NO2

Exam 6: Gases

A balloon with volume 750 cm3 is filled with O2 at 27 °C has a mass of 83.3 g.The mass of empty balloon is 82.1 g.Calculate the pressure of O2.

A gaseous mixture consists of 50.0% O2,25.0% N2,and 25.0% Cl2,by mass.At standard temperature and pressure,the partial pressure of:

What is the ratio of the diffusion rates of Cl2 and O2? (Rate)Cl2/ (Rate)O2 =

Calculate the height of a column of liquid glycerol (d = 1.26 g/cm3),in meters,required to exert the same pressure as 4.91 m of water.

The energy of molecules of a gas:

If a liter of CO2 is compared to a liter of H2,both at 25 °C and one atmosphere pressure,then:

In the reaction How many moles of iron can be produced using 17.4 liters of hydrogen at STP?

In the reaction How many liters of O2 react with 5.0 liters of CH4? All gas volumes are measured at the same temperature and pressure but not at STP.

A 1.37 L vessel contains He at a temperature of 24.5 °C and a pressure of 205 mmHg.A 721 mL vessel contains Ne at a temperature of 36.2 °C and a pressure of 0.185 atm.Both of these gases are placed in a 2.00 L vessel at 302 K.What is the final pressure (in atm)in the 2.00 L vessel?

According to the kinetic-molecular theory of gases,at constant temperature,all particles have equal translational kinetic energy.

Under conditions for which chlorine gas has an effusion rate of 2.4 × 10-6 mol/sec,what would be the effusion rate for bromine gas,in mol/sec?

In a sample of air at STP,the ratio of the root-mean-square velocity of O2 to that of N2,that is urms(O2)/urms(N2),is equal to ________.

If 250.L of nitrogen reacts with 582 L of hydrogen by the reaction: N2(g)+ 3 H2(g)→ 2 NH3(g), How much nitrogen is unreacted? All gases are at the same temperature and pressure.

Three volumes of O2 and one volume of CH4 are placed in a sealed container.The temperature and pressure of this mixture are 120 °C and 600 kPa.What is the pressure in the same container after the explosion of the mixture and after it was cooled to the initial temperature?

Convert 780 Torr to the equivalent pressure in atmospheres.

If someone were to light a cigar at one end of a closed room,persons at the other end of the room might soon perceive an odor due to gaseous emissions from the cigar.Such a phenomenon is an example of:

Subtracting the vapor pressure of water from the total pressure of a gas collected over water is an example of the application of:

Phosphine gas oxidizes spontaneously on exposure to air,as represented by: 2 PH3(g)+ 3 O2(g)→ P2O3(s)+ 3 H2O(g) What volume of oxygen gas,at 720 Torr and 37 °C,would be consumed in the formation of 22.0 g of P2O3 by this process?

The ideal gas equation connects three basic variables: volume,amount,and temperature of a gas.

A 10.0 L container of unknown gas at 25.0 °C contains 87.1 g of gas at 12.5 atm.What gas is in the container?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

A balloon with volume 750 cm³ is filled with O₂at 27 °C has a mass of 83.3 g.The mass of empty balloon is 82.1 g.Calculate the pressure of O₂.

A gaseous mixture consists of 50.0% O₂,25.0% N₂,and 25.0% Cl₂,by mass.At standard temperature and pressure,the partial pressure of:

What is the ratio of the diffusion rates of Cl₂ and O₂? (Rate)Cl_2/ (Rate)O₂ =

Calculate the height of a column of liquid glycerol (d = 1.26 g/cm³),in meters,required to exert the same pressure as 4.91 m of water.

If a liter of CO₂ is compared to a liter of H₂,both at 25 °C and one atmosphere pressure,then:

In the reaction How many liters of O₂ react with 5.0 liters of CH₄? All gas volumes are measured at the same temperature and pressure but not at STP.

Under conditions for which chlorine gas has an effusion rate of 2.4 × 10^-6 mol/sec,what would be the effusion rate for bromine gas,in mol/sec?

In a sample of air at STP,the ratio of the root-mean-square velocity of O₂ to that of N₂,that is u_rms(O₂)/u_rms(N₂),is equal to ________.

If 250.L of nitrogen reacts with 582 L of hydrogen by the reaction: N₂(g)+ 3 H₂(g)→ 2 NH₃(g), How much nitrogen is unreacted? All gases are at the same temperature and pressure.

Three volumes of O₂ and one volume of CH₄ are placed in a sealed container.The temperature and pressure of this mixture are 120 °C and 600 kPa.What is the pressure in the same container after the explosion of the mixture and after it was cooled to the initial temperature?

Phosphine gas oxidizes spontaneously on exposure to air,as represented by: 2 PH₃(g)+ 3 O₂(g)→ P₂O₃(s)+ 3 H₂O(g) What volume of oxygen gas,at 720 Torr and 37 °C,would be consumed in the formation of 22.0 g of P₂O₃ by this process?