Question 1

What is the total pressure in a 8.00-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

Accepted Answer

A) 0.382 atm 
B) 0.681 atm 
C) 0.866 atm 
D) 1.25 atm 
A) 0.382 atm 
B) 0.681 atm 
C) 0.866 atm 
D) 1.25 atm

Question 2

When 30.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Accepted Answer

A) 0.229 L 
B) 0.458 L 
C) 5.14 L 
D) 10.3 L 
A) 0.229 L 
B) 0.458 L 
C) 5.14 L 
D) 10.3 L

Question 3

A greenhouse gas is a gas that can experience a change in dipole moment.Which of the following can be greenhouse gases?

Accepted Answer

A) O2 
B) H2 
C) N2 
D) CH3F 
A) O2 
B) H2 
C) N2 
D) CH3F

Question 4

What is the average speed (actually the root-mean-square speed)of a carbon monoxide molecule at 27°C?

Accepted Answer

A) 450 m/s 
B) 412 m/s 
C) 514 m/s 
D) 517 m/s 
A) 450 m/s 
B) 412 m/s 
C) 514 m/s 
D) 517 m/s

Question 5

A 75.0 L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.20 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Accepted Answer

A) 3.74 g 
B) 54.8 g 
C) 97.3 g 
D) 1425 g 
A) 3.74 g 
B) 54.8 g 
C) 97.3 g 
D) 1425 g

Question 6

Which one of the following gases will have the highest rate of effusion?

Accepted Answer

A) HCN 
B) CO2 
C) Ar 
D) SO2 
A) HCN 
B) CO2 
C) Ar 
D) SO2

Question 7

One mole of gas at 25°C in a 3.0-L flask has a ________ pressure than one mole of gas at 25°C in a 14.0-L flask.

Accepted Answer

The answer of One mole of gas at 25°C in...

Question 8

In the diagram below,nitrogen molecules are represented by unshaded spheres,oxygen molecules by gray spheres,and chlorine molecules by black spheres.  
-If the total pressure in the container is 400.mm Hg,what is the partial pressure of nitrogen?

Accepted Answer

A) 40.0 mm Hg 
B) 80.0 mm Hg 
C) 120.mm Hg 
D) 200.mm Hg 
A) 40.0 mm Hg 
B) 80.0 mm Hg 
C) 120.mm Hg 
D) 200.mm Hg

Question 9

According to the kinetic molecular theory of gases,what is the force of attraction of one CO  molecule for another CO  molecule?

Accepted Answer

There are no attract

Question 10

Hydrogen gas is collected over water in an inverted buret.If the atmospheric pressure is 745 mm Hg,the vapor pressure of water is 18 mm Hg,and a 15.0 cm-high column of water remains in the buret,the pressure of the hydrogen gas is

Accepted Answer

A) 763 mm. 
B) 745 mm Hg. 
C) 727 mm Hg. 
D) less than 727 mm Hg. 
A) 763 mm. 
B) 745 mm Hg. 
C) 727 mm Hg. 
D) less than 727 mm Hg.

Question 11

Which of the following substances has increased markedly due to the use of fossil fuels and contributes to the greenhouse effect?

Accepted Answer

A) CO2 
B) SO2 
C) NO2 
D) O3 
A) CO2 
B) SO2 
C) NO2 
D) O3

Question 12

Refrigeration and air conditioning are a source of greenhouse gases such as

Accepted Answer

A) CHClF2. 
B) Ne. 
C) HBr. 
D) H2. 
A) CHClF2. 
B) Ne. 
C) HBr. 
D) H2.

Question 13

Which of the following instruments directly measures the pressure of a gas?

Accepted Answer

A) spectrometer 
B) manometer 
C) polarimeter 
D) gas chromatograph 
A) spectrometer 
B) manometer 
C) polarimeter 
D) gas chromatograph

Question 14

How many grams of CO  gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Accepted Answer

A) 15.2 g 
B) 29.9 g 
C) 389 g 
D) 2.30 × 104 g 
A) 15.2 g 
B) 29.9 g 
C) 389 g 
D) 2.30 × 104 g

Question 15

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains Ar,flask B contains Ne,flask C contains H2.Which flask contains the largest number of molecules?

Accepted Answer

A) flask A 
B) flask B 
C) flask C 
D) All flasks contain the same number of molecules. 
A) flask A 
B) flask B 
C) flask C 
D) All flasks contain the same number of molecules.

Question 16

The apparatus shown is called a closed-end manometer because the arm not connected to the gas sample is closed to the atmosphere and is under vacuum.  
-When stopcock A of the open-end manometer shown below is opened,which drawing best represents the result?

Accepted Answer

A) drawing (1) 
B) drawing (2) 
C) drawing (3) 
D) drawing (4) 
A) drawing (1) 
B) drawing (2) 
C) drawing (3) 
D) drawing (4)

Question 17

To two significant figures,by what factor will the pressure of an ideal gas change if the temperature of the gas is changed from 100°C to 200°C?

Accepted Answer

The answer of To two significant figures,by what factor will...

Question 18

What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 722 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?

Accepted Answer

A) 636 mm Hg 
B) 713 mm Hg 
C) 731 mm Hg 
D) 808 mm Hg 
A) 636 mm Hg 
B) 713 mm Hg 
C) 731 mm Hg 
D) 808 mm Hg

Question 19

A 55.0-L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Accepted Answer

A) 3.17 g 
B) 8.20 g 
C) 82.9 g 
D) 1210 g 
A) 3.17 g 
B) 8.20 g 
C) 82.9 g 
D) 1210 g

Question 20

Which of the following regions of the earth's atmosphere is closest to the surface of the earth?

Accepted Answer

A) mesosphere 
B) stratosphere 
C) thermosphere 
D) troposphere 
A) mesosphere 
B) stratosphere 
C) thermosphere 
D) troposphere

Exam 10: Gases: Their Properties and Behavior

What is the total pressure in a 8.00-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

When 30.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

A greenhouse gas is a gas that can experience a change in dipole moment.Which of the following can be greenhouse gases?

What is the average speed (actually the root-mean-square speed)of a carbon monoxide molecule at 27°C?

A 75.0 L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.20 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Which one of the following gases will have the highest rate of effusion?

One mole of gas at 25°C in a 3.0-L flask has a ________ pressure than one mole of gas at 25°C in a 14.0-L flask.

In the diagram below,nitrogen molecules are represented by unshaded spheres,oxygen molecules by gray spheres,and chlorine molecules by black spheres. -If the total pressure in the container is 400.mm Hg,what is the partial pressure of nitrogen?

According to the kinetic molecular theory of gases,what is the force of attraction of one CO molecule for another CO molecule?

Hydrogen gas is collected over water in an inverted buret.If the atmospheric pressure is 745 mm Hg,the vapor pressure of water is 18 mm Hg,and a 15.0 cm-high column of water remains in the buret,the pressure of the hydrogen gas is

Which of the following substances has increased markedly due to the use of fossil fuels and contributes to the greenhouse effect?

Refrigeration and air conditioning are a source of greenhouse gases such as

Which of the following instruments directly measures the pressure of a gas?

How many grams of CO gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains Ar,flask B contains Ne,flask C contains H2.Which flask contains the largest number of molecules?

The apparatus shown is called a closed-end manometer because the arm not connected to the gas sample is closed to the atmosphere and is under vacuum. -When stopcock A of the open-end manometer shown below is opened,which drawing best represents the result?

To two significant figures,by what factor will the pressure of an ideal gas change if the temperature of the gas is changed from 100°C to 200°C?

What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 722 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?

A 55.0-L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Which of the following regions of the earth's atmosphere is closest to the surface of the earth?

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What is the total pressure in a 8.00-L flask which contains 0.127 mol of H₂(g)and 0.288 mol of N₂(g)at 20.0°C?

When 30.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

A 75.0 L steel tank at 20.0°C contains acetylene gas,C₂H₂,at a pressure of 1.20 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

How many grams of CO gas are there in a 5.00-L cylinder at 4.00 × 10³ mm Hg and 23°C?

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains Ar,flask B contains Ne,flask C contains H₂.Which flask contains the largest number of molecules?

A 55.0-L steel tank at 20.0°C contains acetylene gas,C₂H₂,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?