Question 1

A 255-mL gas sample weighing 0.292 g is at 52,810 Pa and 127°C.
a.How many moles of gas are present?
b.What is the molar mass of the gas?

Accepted Answer

a.4.05 <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> 10...

Question 2

Select the gas with the highest average kinetic energy per mole at 298 K.

Accepted Answer

A)  O2
B)  CO2
C)  H2O
D)  H2
E)  All have the same average kinetic energy.F) C) and E)
G) A) and D)

Question 3

The air pressure in a volleyball is 75 psi.What is this pressure in torr?

Accepted Answer

A)  520 torr
B)  562 torr
C)  3900 torr
D)  7600 torr
E)  75,000 torrF) A) and B)
G) All of the above

Question 4

A sample of the inert gas krypton has its pressure tripled while its temperature remained constant.If the original volume is 12 L,what is the final volume?

Accepted Answer

A)  4.0 L
B)  6.0 L
C)  9 L
D)  36 L
E)  48 LF) B) and E)
G) C) and D)

Question 5

For a gas obeying Charles' Law,a plot of V versus 1/T will give a straight line passing through the origin.

Accepted Answer

A) True 
 B)False

Question 6

What are the conditions of STP?

Accepted Answer

A)  0 K and l atm
B)  273.15 K and 760 torr
C)  0°C and 760 atm
D)  273.15°C and 760 torr
E)  None of these choices is correct.F) A) and C)
G) C) and E)

Question 7

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water.What is the concentration of a solution prepared by dissolving 225 L of HCl(g) at 37°C and 89.6 kPa in 5.25 L of water?

Accepted Answer

A)  1.49 M
B)  1.66 M
C)  7.82 M
D)  12.5 M
E)  16.6 MF) A) and E)
G) A) and D)

Question 8

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its absolute temperature,other factors remaining constant?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and B)
G) A) and C)

Question 9

Freon-12,CF2Cl2,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Accepted Answer

A)  20 m/s
B)  120 m/s
C)  210 m/s
D)  260 m/s
E)  4.4  ×	imes×  104 m/s F) B) and C)
G) A) and D)

Question 10

A sample container of carbon monoxide occupies a volume of 435 mL at a pressure of 785 torr and a temperature of 298 K.What would its temperature be if the volume were changed to 265 mL at a pressure of 785 torr?

Accepted Answer

A)  182 K
B)  298 K
C)  387 K
D)  489 K
E)  538 KF) C) and E)
G) C) and D)

Question 11

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475°C.Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Accepted Answer

A)  2520 J/mol
B)  4150 J/mol
C)  5920 J/mol
D)  9330 J/mol
E)  5920 kJ/molF) C) and D)
G) B) and C)

Question 12

Nitrogen will behave most like an ideal gas

Accepted Answer

A)  at high temperature and high pressure.
B)  at high temperature and low pressure.
C)  at low temperature and high pressure.
D)  at low temperature and low pressure.
E)  at intermediate (moderate) temperature and pressure.F) C) and E)
G) A) and B)

Question 13

In the fermentation process,yeast converts glucose to ethanol and carbon dioxide.What volume of carbon dioxide,measured at 745 torr and 25.0°C,can be produced by the fermentation of 10.0 g of glucose?
C6H12O6(aq) $\to$ 2C2H5OH(aq)+ 2CO2(g)

Accepted Answer

The answer of In the fermentation process,yeast converts glucose to...

Question 14

Calculate the density in g/L of gaseous SF6 at 50.0°C and 650.torr.

Accepted Answer

Question 15

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles.What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25°C and 1.00 atm?
Li2O(aq) + CO2(g)   →	o→  Li2CO3(s)

Accepted Answer

A)  687 mL
B)  819 mL
C)  687 L
D)  819 L
E)  22.4 L F) A) and E)
G) D) and E)

Question 16

Select the gas with the largest root-mean-square molecular speed at 25°C.

Accepted Answer

A)  NH3
B)  CO
C)  H2
D)  SF6
E)  All the gases have the same root-mean-square molecular speed at 25°C.F) A) and B)
G) C) and D)

Question 17

A 250.0-mL sample of ammonia,NH3(g) ,exerts a pressure of 833 torr at 42.4°C.What mass of ammonia is in the container?

Accepted Answer

A)  0.0787 g
B)  0.180 g
C)  8.04 g
D)  17.0 g
E)  59.8 gF) A) and D)
G) B) and C)

Question 18

Calculate the root-mean-square speed of methane,CH4 (g) ,at 78°C.

Accepted Answer

A)  23 m/s
B)  350 m/s
C)  550 m/s
D)  667 m/s
E)  740 m/sF) A) and C)
G) A) and B)

Question 19

Aluminum metal shavings (10.0 g)are placed in 100.mL of 6.00 M hydrochloric acid.What is the maximum volume of hydrogen,measured at STP,which can be produced?
2Al(s)+ 6HCl(aq) $\to$ 2AlCl3(aq)+ 3H2(g)

Accepted Answer

The answer of Aluminum metal shavings (10.0 g)are placed in...

Question 20

For real gases,PV < nRT,always.

Accepted Answer

A) True 
 B)False

Exam 5: Gases and the Kinetic-Molecular Theory

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water.What is the concentration of a solution prepared by dissolving 225 L of HCl(g) at 37°C and 89.6 kPa in 5.25 L of water?

Correct AnswerverifiedShow Answer

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles.What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25°C and 1.00 atm? Li2O(aq) + CO2(g) →\to→ Li2CO3(s)

Correct AnswerverifiedShow Answer

For a gas obeying Charles' Law,a plot of V versus 1/T will give a straight line passing through the origin.

Correct AnswerverifiedShow Answer

In the fermentation process,yeast converts glucose to ethanol and carbon dioxide.What volume of carbon dioxide,measured at 745 torr and 25.0°C,can be produced by the fermentation of 10.0 g of glucose? C6H12O6(aq) →\to→ 2C2H5OH(aq)+ 2CO2(g)

Correct AnswerverifiedShow Answer

Nitrogen will behave most like an ideal gas

Correct AnswerverifiedShow Answer

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475°C.Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Correct AnswerverifiedShow Answer

Aluminum metal shavings (10.0 g)are placed in 100.mL of 6.00 M hydrochloric acid.What is the maximum volume of hydrogen,measured at STP,which can be produced? 2Al(s)+ 6HCl(aq) →\to→ 2AlCl3(aq)+ 3H2(g)

Correct AnswerverifiedShow Answer

Freon-12,CF2Cl2,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Correct AnswerverifiedShow Answer

A sample of the inert gas krypton has its pressure tripled while its temperature remained constant.If the original volume is 12 L,what is the final volume?

Correct AnswerverifiedShow Answer

The air pressure in a volleyball is 75 psi.What is this pressure in torr?

Correct AnswerverifiedShow Answer

What are the conditions of STP?

Correct AnswerverifiedShow Answer

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its absolute temperature,other factors remaining constant?

Correct AnswerverifiedShow Answer

Calculate the root-mean-square speed of methane,CH4 (g) ,at 78°C.

Correct AnswerverifiedShow Answer

For real gases,PV < nRT,always.

Correct AnswerverifiedShow Answer

Calculate the density in g/L of gaseous SF6 at 50.0°C and 650.torr.

Correct AnswerverifiedShow Answer

A sample container of carbon monoxide occupies a volume of 435 mL at a pressure of 785 torr and a temperature of 298 K.What would its temperature be if the volume were changed to 265 mL at a pressure of 785 torr?

Correct AnswerverifiedShow Answer

Select the gas with the largest root-mean-square molecular speed at 25°C.

Correct AnswerverifiedShow Answer

Select the gas with the highest average kinetic energy per mole at 298 K.

Correct AnswerverifiedShow Answer

A 255-mL gas sample weighing 0.292 g is at 52,810 Pa and 127°C. a.How many moles of gas are present? b.What is the molar mass of the gas?

Correct Answerverifieda.4.05 10...View AnswerShow Answer

A 250.0-mL sample of ammonia,NH3(g) ,exerts a pressure of 833 torr at 42.4°C.What mass of ammonia is in the container?

Correct AnswerverifiedShow Answer

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Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles.What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25°C and 1.00 atm? Li₂O(aq) + CO₂(g) $\to$ Li₂CO₃(s)

Correct Answer
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Correct Answer
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In the fermentation process,yeast converts glucose to ethanol and carbon dioxide.What volume of carbon dioxide,measured at 745 torr and 25.0°C,can be produced by the fermentation of 10.0 g of glucose? C₆H₁₂O₆(aq) $\to$ 2C₂H₅OH(aq)+ 2CO₂(g)

Correct Answer
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Correct Answer
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Correct Answer
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Aluminum metal shavings (10.0 g)are placed in 100.mL of 6.00 M hydrochloric acid.What is the maximum volume of hydrogen,measured at STP,which can be produced? 2Al(s)+ 6HCl(aq) $\to$ 2AlCl₃(aq)+ 3H₂(g)

Correct Answer
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Freon-12,CF₂Cl₂,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Calculate the root-mean-square speed of methane,CH₄ (g) ,at 78°C.

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Correct Answer
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Calculate the density in g/L of gaseous SF₆ at 50.0°C and 650.torr.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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a.4.05 10...
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A 250.0-mL sample of ammonia,NH₃(g) ,exerts a pressure of 833 torr at 42.4°C.What mass of ammonia is in the container?

Correct Answer
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