Question 1

Which of the following is not a postulates of the kinetic molecular theory of gases?

Accepted Answer

A) The gas molecules are in constant motion. 
B) At a constant temperature,each molecule has the same kinetic energy. 
C) The collisions between molecules are elastic. 
D) The volumes of the molecules are negligible compared with the volume of the container. 
E) The gas molecules are in rapid motion. 
A) The gas molecules are in constant motion. 
B) At a constant temperature,each molecule has the same kinetic energy. 
C) The collisions between molecules are elastic. 
D) The volumes of the molecules are negligible compared with the volume of the container. 
E) The gas molecules are in rapid motion. B

Question 2

A 23.6 -L sample of nitrogen at 4.45 atm and 23°C is simultaneously expanded to 50.8 L and heated to 37°C.What is the new pressure of the gas?

Accepted Answer

A) 3.33 atm 
B) 2.17 atm 
C) 167 atm 
D) 257 atm 
E) 1.97 atm 
A) 3.33 atm 
B) 2.17 atm 
C) 167 atm 
D) 257 atm 
E) 1.97 atm B

Question 3

A rigid container is charged with a gas to a pressure of 740 mmHg at 40.0°C and tightly sealed.If the temperature of the gas increases by 80.0°C what is the new pressure?

Accepted Answer

A) 1480 mmHg 
B) 589 mmHg 
C) 551 mmHg 
D) 929 mmHg 
E) 1110 mmHg 
A) 1480 mmHg 
B) 589 mmHg 
C) 551 mmHg 
D) 929 mmHg 
E) 1110 mmHg D

Question 4

A gas occupying a volume of 1.50 L exerts a pressure of 700 mmHg at 200°C.Which mathematical expression gives the correct pressure at 3.50 L and 350°C?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 5

A high temperature reaction vessel is charged with 0.5080 mol of iron powder and 42.1 L of oxygen gas at standard temperature at pressure.On heating,the iron and oxygen react according to the balanced reaction below.
4Fe(s)+ 3O2(g)→ 2Fe2O3(s)
After the reaction vessel is cooled,and assuming the reaction goes to completion,what volume of oxygen remains?

Accepted Answer

A) 33.5 L 
B) 42.1 L 
C) 26.9 L 
D) 8.53 L 
E) 0.254 L 
A) 33.5 L 
B) 42.1 L 
C) 26.9 L 
D) 8.53 L 
E) 0.254 L

Question 6

The following equation represents the oxidation of ammonia,NH3.
4NH3(g)+ 5O2(g)→ 4NO(g)+ 6H2O(g)
At the same temperature and pressure,what is the maximum volume of nitrogen monoxide that can be obtained from 7.55 × 102 L of ammonia and 7.55 × 102 L of oxygen?

Accepted Answer

A) 1.7 × 103 L 
B) 3.36 × 102 L 
C) 6.04 × 102 L 
D) 1.51 × 103 L 
E) 7.55 × 102 L 
A) 1.7 × 103 L 
B) 3.36 × 102 L 
C) 6.04 × 102 L 
D) 1.51 × 103 L 
E) 7.55 × 102 L

Question 7

A flexible vessel contains 78.00 L of gas at a pressure of 1.50 atm.Under conditions of constant temperature and moles of gas,what is the pressure of the gas when the volume of the vessel is tripled?

Accepted Answer

A) 0.572 atm 
B) 4.5111 atm 
C) 2.38 atm 
D) 1.5 atm 
E) 0.025578 atm 
A) 0.572 atm 
B) 4.5111 atm 
C) 2.38 atm 
D) 1.5 atm 
E) 0.025578 atm

Question 8

A sample of methane,CH4,occupies a volume of 318.0 mL at 25°C and exerts a pressure of 1010.0 mmHg.If the volume of the gas is allowed to expand to 770.0 mL at 298 K,what will be the pressure of the gas?

Accepted Answer

A) 2440 mmHg 
B) 4970 mmHg 
C) 417.1 mmHg 
D) 0.01727 mmHg 
E) 452 mmHg 
A) 2440 mmHg 
B) 4970 mmHg 
C) 417.1 mmHg 
D) 0.01727 mmHg 
E) 452 mmHg

Question 9

A 28.3-g mixture of oxygen and argon is found to occupy a volume of 17.2 L when measured at 882.7 mmHg and 39.3oC.What is the partial pressure of oxygen in this mixture?

Accepted Answer

A) 369 mmHg 
B) 441 mmHg 
C) 512 mmHg 
D) 418 mmHg 
E) 464 mmHg 
A) 369 mmHg 
B) 441 mmHg 
C) 512 mmHg 
D) 418 mmHg 
E) 464 mmHg

Question 10

What is the ratio of the average speed of He molecules to that of CH4 molecules at 298 K?

Accepted Answer

A) 1:1 
B) 11:7 
C) 2:3 
D) 3:2 
E) 2:1 
A) 1:1 
B) 11:7 
C) 2:3 
D) 3:2 
E) 2:1

Question 11

Which of the following relates the rate of effusion of a gas to the square root of its molar mass?

Accepted Answer

A) Boyle's law 
B) Graham's law 
C) Charles's law 
D) Dalton's law 
E) Avogadro's hypothesis 
A) Boyle's law 
B) Graham's law 
C) Charles's law 
D) Dalton's law 
E) Avogadro's hypothesis

Question 12

An excess of sodium hydroxide is treated with 2.9 L of dry hydrogen chloride gas measured at STP.What is the mass of sodium chloride is formed?

Accepted Answer

A) 1.45g 
B) 15.1 g 
C) 7.6 g 
D) 15 g 
E) 169 g 
A) 1.45g 
B) 15.1 g 
C) 7.6 g 
D) 15 g 
E) 169 g

Question 13

What is the ratio of the average rate of effusion of CH4(g)to that of NOF(g)at 400 K?

Accepted Answer

A) 49:16 
B) 4:7 
C) 16:49 
D) 7:4 
E) The average rate of effusion is the same for the two gases. 
A) 49:16 
B) 4:7 
C) 16:49 
D) 7:4 
E) The average rate of effusion is the same for the two gases.

Question 14

The density of a gas is 0.803 g/L at STP.What is its molar mass?

Accepted Answer

A) 5.0 g/mol 
B) 24.1 g/mol 
C) 27.9 g/mol 
D) 22.4 g/mol 
E) 18.0 g/mol 
A) 5.0 g/mol 
B) 24.1 g/mol 
C) 27.9 g/mol 
D) 22.4 g/mol 
E) 18.0 g/mol

Question 15

A flexible container is charged with a certain volume of gas at 315.0 Κ.Under conditions of constant pressure and moles of gas,how does the temperature of the gas change when the volume is tripled?

Accepted Answer

A) The temperature increases by a factor of three. 
B) The temperature decreases by a factor of four. 
C) The temperature decreases by a factor of two. 
D) The temperature increases by a factor of four. 
E) The temperature increases by a factor of two. 
A) The temperature increases by a factor of three. 
B) The temperature decreases by a factor of four. 
C) The temperature decreases by a factor of two. 
D) The temperature increases by a factor of four. 
E) The temperature increases by a factor of two.

Question 16

The _____ is an equation similar to the ideal gas law,but includes two constants,a and b,to account for deviations from ideal behavior.

Accepted Answer

A) ​Clasius-Clapeyron equation 
B) ​van der Waals equation 
C) ​de Broglie equation 
D) ​Laue equation 
E) ​Arrhenius equation 
A) ​Clasius-Clapeyron equation 
B) ​van der Waals equation 
C) ​de Broglie equation 
D) ​Laue equation 
E) ​Arrhenius equation

Question 17

A 2.00-L glass soda bottle filled only with air is tightly capped at 25°C and 728.0 mmHg.If the bottle is placed in water at 65°C,what is the pressure in the bottle?

Accepted Answer

A) 280 mmHg 
B) 826 mmHg 
C) 1890 mmHg 
D) 642 mmHg 
E) 324 mmHg 
A) 280 mmHg 
B) 826 mmHg 
C) 1890 mmHg 
D) 642 mmHg 
E) 324 mmHg

Question 18

A mixture consisting of 0.140 mol N2,0.037 mol O2,0.104 mol CH4,and an unknown amount of CO2 occupies a volume of 8.48 L at 27°C and 1.06 atm pressure.How many moles of CO2 are there in this sample?

Accepted Answer

A) 0.719 mol 
B) 0.0839 mol 
C) 2.45 mol 
D) 3.77 mol 
E) 0.364 mol 
A) 0.719 mol 
B) 0.0839 mol 
C) 2.45 mol 
D) 3.77 mol 
E) 0.364 mol

Question 19

According to the postulates of the kinetic theory of gases,the root-mean-square (rms)speed of the molecules of a given gas is proportional to the

Accepted Answer

A) reciprocal of the absolute temperature. 
B) Celsius temperature squared. 
C) absolute temperature. 
D) square root of the absolute temperature. 
E) absolute temperature squared. 
A) reciprocal of the absolute temperature. 
B) Celsius temperature squared. 
C) absolute temperature. 
D) square root of the absolute temperature. 
E) absolute temperature squared.

Question 20

What does R denote in the ideal gas equation,PV = nRT?

Accepted Answer

A) ​Coulomb's constant 
B) ​Rydberg constant 
C) ​Boltzmann constant 
D) ​Atomic mass constant 
E) ​Molar gas constant 
A) ​Coulomb's constant 
B) ​Rydberg constant 
C) ​Boltzmann constant 
D) ​Atomic mass constant 
E) ​Molar gas constant

Exam 5: The Gaseous State

Which of the following is not a postulates of the kinetic molecular theory of gases?

A 23.6 -L sample of nitrogen at 4.45 atm and 23°C is simultaneously expanded to 50.8 L and heated to 37°C.What is the new pressure of the gas?

A rigid container is charged with a gas to a pressure of 740 mmHg at 40.0°C and tightly sealed.If the temperature of the gas increases by 80.0°C what is the new pressure?

A gas occupying a volume of 1.50 L exerts a pressure of 700 mmHg at 200°C.Which mathematical expression gives the correct pressure at 3.50 L and 350°C?

The following equation represents the oxidation of ammonia,NH3. 4NH3(g)+ 5O2(g)→ 4NO(g)+ 6H2O(g) At the same temperature and pressure,what is the maximum volume of nitrogen monoxide that can be obtained from 7.55 × 102 L of ammonia and 7.55 × 102 L of oxygen?

A flexible vessel contains 78.00 L of gas at a pressure of 1.50 atm.Under conditions of constant temperature and moles of gas,what is the pressure of the gas when the volume of the vessel is tripled?

A sample of methane,CH4,occupies a volume of 318.0 mL at 25°C and exerts a pressure of 1010.0 mmHg.If the volume of the gas is allowed to expand to 770.0 mL at 298 K,what will be the pressure of the gas?

A 28.3-g mixture of oxygen and argon is found to occupy a volume of 17.2 L when measured at 882.7 mmHg and 39.3oC.What is the partial pressure of oxygen in this mixture?

What is the ratio of the average speed of He molecules to that of CH4 molecules at 298 K?

Which of the following relates the rate of effusion of a gas to the square root of its molar mass?

An excess of sodium hydroxide is treated with 2.9 L of dry hydrogen chloride gas measured at STP.What is the mass of sodium chloride is formed?

What is the ratio of the average rate of effusion of CH4(g)to that of NOF(g)at 400 K?

The density of a gas is 0.803 g/L at STP.What is its molar mass?

A flexible container is charged with a certain volume of gas at 315.0 Κ.Under conditions of constant pressure and moles of gas,how does the temperature of the gas change when the volume is tripled?

The _____ is an equation similar to the ideal gas law,but includes two constants,a and b,to account for deviations from ideal behavior.

A 2.00-L glass soda bottle filled only with air is tightly capped at 25°C and 728.0 mmHg.If the bottle is placed in water at 65°C,what is the pressure in the bottle?

A mixture consisting of 0.140 mol N2,0.037 mol O2,0.104 mol CH4,and an unknown amount of CO2 occupies a volume of 8.48 L at 27°C and 1.06 atm pressure.How many moles of CO2 are there in this sample?

According to the postulates of the kinetic theory of gases,the root-mean-square (rms)speed of the molecules of a given gas is proportional to the

What does R denote in the ideal gas equation,PV = nRT?

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The following equation represents the oxidation of ammonia,NH₃. 4NH₃(g)+ 5O₂(g)→ 4NO(g)+ 6H₂O(g) At the same temperature and pressure,what is the maximum volume of nitrogen monoxide that can be obtained from 7.55 × 10² L of ammonia and 7.55 × 10² L of oxygen?

A sample of methane,CH₄,occupies a volume of 318.0 mL at 25°C and exerts a pressure of 1010.0 mmHg.If the volume of the gas is allowed to expand to 770.0 mL at 298 K,what will be the pressure of the gas?

A 28.3-g mixture of oxygen and argon is found to occupy a volume of 17.2 L when measured at 882.7 mmHg and 39.3^oC.What is the partial pressure of oxygen in this mixture?

What is the ratio of the average speed of He molecules to that of CH₄ molecules at 298 K?

What is the ratio of the average rate of effusion of CH₄(g)to that of NOF(g)at 400 K?

A mixture consisting of 0.140 mol N₂,0.037 mol O₂,0.104 mol CH₄,and an unknown amount of CO₂ occupies a volume of 8.48 L at 27°C and 1.06 atm pressure.How many moles of CO₂ are there in this sample?