Question 1

A particular gas exerts a pressure of 5.56 × 104 Pa.What is this pressure in units of bar?

Accepted Answer

A) ​5.56 × 109 bar 
B) ​0.556 bar 
C) ​73.1 bar 
D) ​5.49 ×104 bar 
E) ​5.63 × 104 bar 
A) ​5.56 × 109 bar 
B) ​0.556 bar 
C) ​73.1 bar 
D) ​5.49 ×104 bar 
E) ​5.63 × 104 bar

Question 2

A small amount wet of hydrogen gas (H2)can be prepared by the reaction of zinc with excess hydrochloric acid and trapping the gas produced in an inverted tube initially filled with water.If the total pressure of the gas in the collection tube is 757.9 mmHg at 25°C,what is the partial pressure of the hydrogen? The vapor pressure of water is 23.8 mmHg.

Accepted Answer

A) 734.1 mmHg 
B) 781.7 mmHg 
C) 757.9 mmHg 
D) 32.8 mmHg 
E) 47.7 mmHg 
A) 734.1 mmHg 
B) 781.7 mmHg 
C) 757.9 mmHg 
D) 32.8 mmHg 
E) 47.7 mmHg

Question 3

Which conditions of P,T,and n,respectively,are most ideal?

Accepted Answer

A) low P,low T,low n 
B) high P,low T,high n 
C) low P,high T,high n 
D) low P,high T,low n 
E) high P,high T,high n 
A) low P,low T,low n 
B) high P,low T,high n 
C) low P,high T,high n 
D) low P,high T,low n 
E) high P,high T,high n

Question 4

Calculate the root-mean-square velocity for the O2 molecules in a sample of O2 gas at 28.3°C.(R = 8.3145 J/K⋅mol)

Accepted Answer

A) 15.33 m/s 
B) 148.5 m/s 
C) 279.8 m/s 
D) 484.6 m/s 
E) 9.229 × 1026 m/s 
A) 15.33 m/s 
B) 148.5 m/s 
C) 279.8 m/s 
D) 484.6 m/s 
E) 9.229 × 1026 m/s

Question 5

A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg.Its volume is 568 mL.After water vapor is removed,what volume would the hydrogen occupy at the same conditions of pressure and temperature? (The vapor pressure of water at 23.0°C is 21 mmHg.)

Accepted Answer

A) 509 mL 
B) 539 mL 
C) 552 mL 
D) 568 mL 
E) 585 mL 
A) 509 mL 
B) 539 mL 
C) 552 mL 
D) 568 mL 
E) 585 mL

Question 6

If 636.0 mL of nitrogen gas,measured at 488.9 mmHg and 22.3oC,reacts with excess iodine according to the following reaction,what mass of nitrogen triiodide is produced?
N2(g)+ 3I2(s)→ 2NI3(s)

Accepted Answer

A) 0.472 g 
B) 6.66 g 
C) 3.33 g 
D) 13.3 g 
E) 176 g 
A) 0.472 g 
B) 6.66 g 
C) 3.33 g 
D) 13.3 g 
E) 176 g

Question 7

A fixed amount of gas in a rigid container is heated from 300 to 600 K.Which of the following responses best describes what will happen to the pressure of the gas?

Accepted Answer

A) The pressure will increase by a factor of 2. 
B) The pressure will increase by a factor less than 2. 
C) The pressure will increase by a factor greater than 2. 
D) The pressure will decrease by a factor of 2. 
E) The pressure will remain the same. 
A) The pressure will increase by a factor of 2. 
B) The pressure will increase by a factor less than 2. 
C) The pressure will increase by a factor greater than 2. 
D) The pressure will decrease by a factor of 2. 
E) The pressure will remain the same.

Question 8

A gas occupies a volume of 2.00 L at 780 mmHg and 70.0°C.Which of the following mathematical expressions will yield its volume at STP?

Accepted Answer

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

Question 9

A 1.00-L bulb contains a sample of O2 at 25°C and 1.00 atm pressure.A second 1.00-L bulb contains a sample of CH4 at 25°C and 1.00 atm pressure.What is the ratio of the number of molecules of methane to the number of molecules of oxygen in each of the containers?

Accepted Answer

A) 2:5 
B)    
C) 5:2 
D)    
E) 1:1 
A) 2:5 
B)    
C) 5:2 
D)    
E) 1:1

Question 10

When the valve between the 2.00-L bulb,in which the gas pressure is 2.50 atm,and the 3.00-L bulb,in which the gas pressure is 1.50 atm,is opened,what will be the final pressure in the two bulbs? Assume the temperature remains constant.

Accepted Answer

A) 1.90 atm 
B) 4.00 atm 
C) 2.17 atm 
D) 2.10 atm 
E) 1.83 atm 
A) 1.90 atm 
B) 4.00 atm 
C) 2.17 atm 
D) 2.10 atm 
E) 1.83 atm

Question 11

A sample of oxygen is collected over water at a total pressure of 678.4 mmHg at 25°C.The vapor pressure of water at 25°C is 23.8 mmHg.The partial pressure of the O2 is

Accepted Answer

A) 0.9239 atm. 
B) 0.9161 atm. 
C) 0.8926 atm. 
D) 1.092 atm. 
E) 0.8613 atm. 
A) 0.9239 atm. 
B) 0.9161 atm. 
C) 0.8926 atm. 
D) 1.092 atm. 
E) 0.8613 atm.

Question 12

How many moles of gas are in a gas sample occupying 1.40 L at 553 mmHg and 294 K?

Accepted Answer

A) 32.1 mol 
B) 0.0422 mol 
C) 23.7 mol 
D) 0.00346 mol 
E) 2.63 mol 
A) 32.1 mol 
B) 0.0422 mol 
C) 23.7 mol 
D) 0.00346 mol 
E) 2.63 mol

Question 13

A 22.4 L high pressure reaction vessel is charged with 0.5020 mol of iron powder and 1.39 atm of oxygen gas at standard temperature.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 pressure of oxygen remains?

Accepted Answer

A) 1 atm 
B) 1.385 atm 
C) 0.715 atm 
D) 0.376 atm 
E) 0.251 atm 
A) 1 atm 
B) 1.385 atm 
C) 0.715 atm 
D) 0.376 atm 
E) 0.251 atm

Question 14

Which of the following is included as a postulate in the kinetic molecular theory of an ideal gas?

Accepted Answer

A) Collisions between molecules are all elastic. 
B) All molecules move randomly in zigzag directions. 
C) The distance between gas molecules is small compared with the size of the molecule. 
D) All the molecules have the same velocity. 
E) In an average collision between molecules,both molecules have the same kinetic energy. 
A) Collisions between molecules are all elastic. 
B) All molecules move randomly in zigzag directions. 
C) The distance between gas molecules is small compared with the size of the molecule. 
D) All the molecules have the same velocity. 
E) In an average collision between molecules,both molecules have the same kinetic energy.

Question 15

A gas occupies a volume of 2.75 L at 350 mmHg and 200°C.Which mathematical expression gives the correct volume at 600 mmHg and 250°C?

Accepted Answer

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

Question 16

Which of the following is a correct statement of Charles's law,   ?

Accepted Answer

A) The volume of a gas varies proportionally with the pressure. 
B) The volume of a gas sample varies directly with the absolute temperature. 
C) All gas samples of the same volume at STP contain the same number of atoms. 
D) The pressure of a gas sample varies inversely with the volume. 
E) All gas samples of the same volume at STP contain the same number of molecules. 
A) The volume of a gas varies proportionally with the pressure. 
B) The volume of a gas sample varies directly with the absolute temperature. 
C) All gas samples of the same volume at STP contain the same number of atoms. 
D) The pressure of a gas sample varies inversely with the volume. 
E) All gas samples of the same volume at STP contain the same number of molecules.

Question 17

The molar mass of an unknown gas was measured by an effusion experiment.It was found that it took 60 s for the gas to effuse,whereas nitrogen gas required 48 s.The molar mass of the gas is

Accepted Answer

A) 25 g/mol. 
B) 35 g/mol. 
C) 18 g/mol. 
D) 31 g/mol. 
E) 44 g/mol. 
A) 25 g/mol. 
B) 35 g/mol. 
C) 18 g/mol. 
D) 31 g/mol. 
E) 44 g/mol.

Question 18

Calcium nitrate will react with ammonium chloride at slightly elevated temperatures,as represented in the equation below.
Ca(NO3)2(s)+ 2NH4Cl(s)→ 2N2O(g)+ CaCl2(s)+ 4H2O(g)
What is the maximum volume of N2O at STP that could be produced using a 5.20-mol sample of each reactant?

Accepted Answer

A) 1.42 × 103 L 
B) 233 L 
C) 8.58 × 10-3 L 
D) 116 L 
E) 22.4 L 
A) 1.42 × 103 L 
B) 233 L 
C) 8.58 × 10-3 L 
D) 116 L 
E) 22.4 L

Question 19

At STP,as the molar mass of the molecules that make up a pure gas increases,the

Accepted Answer

A) root mean square speed of the molecules increases. 
B) root mean square speed of the molecules decreases. 
C) root mean square speed of the molecules remains constant. 
D) root mean square speed increases to a maximum,then decreases. 
E) none of the above. 
A) root mean square speed of the molecules increases. 
B) root mean square speed of the molecules decreases. 
C) root mean square speed of the molecules remains constant. 
D) root mean square speed increases to a maximum,then decreases. 
E) none of the above.

Question 20

In which of the following reactions will the pressure increase upon completion of the reaction at constant temperature?

Accepted Answer

A) C(s)+ O2(g)→ CO2(g) 
B) 2NO(g)+ O2(g)→ 2NO2(g) 
C) C2H6O(l)+ 3O2(g)→ 2CO2(g)+ 3H2O(l) 
D) 4NH3(g)+ 5O2(g)→ 4NO(g)+ 6H2O(g) 
E) Cl2(g)+ 3F2(g)→ 2ClF3(g) 
A) C(s)+ O2(g)→ CO2(g) 
B) 2NO(g)+ O2(g)→ 2NO2(g) 
C) C2H6O(l)+ 3O2(g)→ 2CO2(g)+ 3H2O(l) 
D) 4NH3(g)+ 5O2(g)→ 4NO(g)+ 6H2O(g) 
E) Cl2(g)+ 3F2(g)→ 2ClF3(g)

Exam 5: The Gaseous State

A particular gas exerts a pressure of 5.56 × 104 Pa.What is this pressure in units of bar?

Which conditions of P,T,and n,respectively,are most ideal?

Calculate the root-mean-square velocity for the O2 molecules in a sample of O2 gas at 28.3°C.(R = 8.3145 J/K⋅mol)

If 636.0 mL of nitrogen gas,measured at 488.9 mmHg and 22.3oC,reacts with excess iodine according to the following reaction,what mass of nitrogen triiodide is produced? N2(g)+ 3I2(s)→ 2NI3(s)

A fixed amount of gas in a rigid container is heated from 300 to 600 K.Which of the following responses best describes what will happen to the pressure of the gas?

A gas occupies a volume of 2.00 L at 780 mmHg and 70.0°C.Which of the following mathematical expressions will yield its volume at STP?

A 1.00-L bulb contains a sample of O2 at 25°C and 1.00 atm pressure.A second 1.00-L bulb contains a sample of CH4 at 25°C and 1.00 atm pressure.What is the ratio of the number of molecules of methane to the number of molecules of oxygen in each of the containers?

When the valve between the 2.00-L bulb,in which the gas pressure is 2.50 atm,and the 3.00-L bulb,in which the gas pressure is 1.50 atm,is opened,what will be the final pressure in the two bulbs? Assume the temperature remains constant.

A sample of oxygen is collected over water at a total pressure of 678.4 mmHg at 25°C.The vapor pressure of water at 25°C is 23.8 mmHg.The partial pressure of the O2 is

How many moles of gas are in a gas sample occupying 1.40 L at 553 mmHg and 294 K?

Which of the following is included as a postulate in the kinetic molecular theory of an ideal gas?

A gas occupies a volume of 2.75 L at 350 mmHg and 200°C.Which mathematical expression gives the correct volume at 600 mmHg and 250°C?

Which of the following is a correct statement of Charles's law, ?

The molar mass of an unknown gas was measured by an effusion experiment.It was found that it took 60 s for the gas to effuse,whereas nitrogen gas required 48 s.The molar mass of the gas is

Calcium nitrate will react with ammonium chloride at slightly elevated temperatures,as represented in the equation below. Ca(NO3)2(s)+ 2NH4Cl(s)→ 2N2O(g)+ CaCl2(s)+ 4H2O(g) What is the maximum volume of N2O at STP that could be produced using a 5.20-mol sample of each reactant?

At STP,as the molar mass of the molecules that make up a pure gas increases,the

In which of the following reactions will the pressure increase upon completion of the reaction at constant temperature?

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Filters

A particular gas exerts a pressure of 5.56 × 10⁴ Pa.What is this pressure in units of bar?

Calculate the root-mean-square velocity for the O₂ molecules in a sample of O₂ gas at 28.3°C.(R = 8.3145 J/K⋅mol)

If 636.0 mL of nitrogen gas,measured at 488.9 mmHg and 22.3^oC,reacts with excess iodine according to the following reaction,what mass of nitrogen triiodide is produced? N₂(g)+ 3I₂(s)→ 2NI₃(s)

A 1.00-L bulb contains a sample of O₂ at 25°C and 1.00 atm pressure.A second 1.00-L bulb contains a sample of CH₄ at 25°C and 1.00 atm pressure.What is the ratio of the number of molecules of methane to the number of molecules of oxygen in each of the containers?

A sample of oxygen is collected over water at a total pressure of 678.4 mmHg at 25°C.The vapor pressure of water at 25°C is 23.8 mmHg.The partial pressure of the O₂ is

Calcium nitrate will react with ammonium chloride at slightly elevated temperatures,as represented in the equation below. Ca(NO₃)₂(s)+ 2NH₄Cl(s)→ 2N₂O(g)+ CaCl₂(s)+ 4H₂O(g) What is the maximum volume of N₂O at STP that could be produced using a 5.20-mol sample of each reactant?