Question 1

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the work done by the gas in the process?

Accepted Answer

A)  0 J
B)  5.0 J
C)  -5.0 J
D)  -10 JE) B) and C)
F) None of the above

Question 2

Two ideal Carnot heat engines have the same efficiency.One operates between 5.0 × 102 K and 3.0 × 102 K,and the other between 4.0 × 102 K and some lower temperature.What is the lower temperature?

Accepted Answer

A)  200 K
B)  220 K
C)  240 K
D)  260 K
E)  280 KF) C) and E)
G) A) and B)

Question 3

During an isochoric process,the internal (thermal) energy of a gas decreases by 50 J.How much heat is added to the gas during this process?

Accepted Answer

A)  0 J
B)  50 J
C)  -50 J
D)  25 J
E)  -25 JF) A) and E)
G) A) and C)

Question 4

An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C.How much energy does it use to remove 2000 J of heat from the interior of the house?

Accepted Answer

A)  105 J
B)  130 J
C)  780 J
D)  520 J
E)  340 JF) A) and B)
G) None of the above

Question 5

The temperature of an ideal gas in a sealed rigid 0.60- 
Container is reduced from 460 K to 
The final pressure of the gas is 
The molar heat capacity at constant volume of the gas is 28.0 J/mol ∙ K.How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ∙ K)

Accepted Answer

A)  -130 kJ
B)  -170 kJ
C)  130 kJ
D)  170 kJ
E)  0 kJF) None of the above
G) A) and B)

Question 6

A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K.This feat is accomplished by removing 400 J of energy from the gas.How much work is done by the gas during this process?

Accepted Answer

A)  0 J
B)  400 J
C)  -400 J
D)  -200 J
E)  200 JF) B) and C)
G) C) and D)

Question 7

An expansion process on an ideal diatomic ideal gas for which CV = 5/2 R has a linear path between the initial and final coordinates on a pV diagram.The coordinates of the initial state are: the pressure is V = 5/2 R has a linear path between the initial and final coordinates on a pV diagram.The coordinates of the initial state are: the pressure is   The volume is   And the temperature is   The final pressure is   And the final temperature is   What is the change in the internal (thermal) energy of the gas,during this process? (R = 8.31 J/mol ∙ K)  A) -2,900 J B) -1,700 J C) 2,900 J D) 1,700 J E) 0 J" class="answers-bank-image d-inline" rel="preload" >
The volume is V = 5/2 R has a linear path between the initial and final coordinates on a pV diagram.The coordinates of the initial state are: the pressure is   The volume is   And the temperature is   The final pressure is   And the final temperature is   What is the change in the internal (thermal) energy of the gas,during this process? (R = 8.31 J/mol ∙ K)  A) -2,900 J B) -1,700 J C) 2,900 J D) 1,700 J E) 0 J" class="answers-bank-image d-inline" rel="preload" >
And the temperature is V = 5/2 R has a linear path between the initial and final coordinates on a pV diagram.The coordinates of the initial state are: the pressure is   The volume is   And the temperature is   The final pressure is   And the final temperature is   What is the change in the internal (thermal) energy of the gas,during this process? (R = 8.31 J/mol ∙ K)  A) -2,900 J B) -1,700 J C) 2,900 J D) 1,700 J E) 0 J" class="answers-bank-image d-inline" rel="preload" >
The final pressure is V = 5/2 R has a linear path between the initial and final coordinates on a pV diagram.The coordinates of the initial state are: the pressure is   The volume is   And the temperature is   The final pressure is   And the final temperature is   What is the change in the internal (thermal) energy of the gas,during this process? (R = 8.31 J/mol ∙ K)  A) -2,900 J B) -1,700 J C) 2,900 J D) 1,700 J E) 0 J" class="answers-bank-image d-inline" rel="preload" >
And the final temperature is V = 5/2 R has a linear path between the initial and final coordinates on a pV diagram.The coordinates of the initial state are: the pressure is   The volume is   And the temperature is   The final pressure is   And the final temperature is   What is the change in the internal (thermal) energy of the gas,during this process? (R = 8.31 J/mol ∙ K)  A) -2,900 J B) -1,700 J C) 2,900 J D) 1,700 J E) 0 J" class="answers-bank-image d-inline" rel="preload" >
What is the change in the internal (thermal) energy of the gas,during this process? (R = 8.31 J/mol ∙ K)

Accepted Answer

A)  -2,900 J
B)  -1,700 J
C)  2,900 J
D)  1,700 J
E)  0 JF) B) and E)
G) A) and B)

Question 8

A certain ideal gas has a molar specific heat at constant volume 7R/2.What is its molar specific heat at constant pressure?

Accepted Answer

A)  5R/2
B)  3R/2
C)  8R
D)  9R/2
E)  6RF) B) and C)
G) C) and D) D

Question 9

A heat pump absorbs heat from the atmosphere at a rate of 30 kW.If work is being done to run this heat pump at a rate of 7.7 kW,what is the coefficient of performance (COP) of the heat pump?

Accepted Answer

A)  3.9
B)  4.9
C)  2.9
D)  0.26
E)  22F) B) and E)
G) B) and D)

Question 10

A heat engine having the maximum possible efficiency has an efficiency of 35.0% when operating between two heat reservoirs.If the temperature of the hot reservoir is 700 K,what is the temperature of the cold reservoir?

Accepted Answer

A)  200 K
B)  245 K
C)  350 K
D)  455 K
E)  600 KF) C) and D)
G) D) and E)

Question 11

In a given reversible process,the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume.Which one of the following statements about the gas is correct?

Accepted Answer

A)  The gas must absorb heat from its surroundings.
B)  The gas must release heat to its surroundings.
C)  The pressure of the gas also stays constant.
D)  The process is adiabatic.
E)  It is impossible to predict on the basis of this data.F) B) and C)
G) D) and E)

Question 12

During each cycle of operation,a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room.How much work input is required in each cycle?

Accepted Answer

A)  712 J
B)  586 J
C)  460 J
D)  126 JE) A) and B)
F) All of the above

Question 13

An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at 
Has an efficiency of 
What is the temperature of the warm reservoir?

Accepted Answer

A)  1.98 K
B)  0.180 K
C)  157 K
D)  0.160 KE) None of the above
F) All of the above A

Question 14

A rigid container is filled with 4.0 mol of air with CV = 2.5R.How much does the internal (thermal) energy of the air change if its temperature rises from V = 2.5R.How much does the internal (thermal) energy of the air change if its temperature rises from   To   (R = 8.31 J/mol ∙ K)  A) 35,800 J B) 430 J C) 3,580 J D) 8,940 J" class="answers-bank-image d-inline" rel="preload" >
To V = 2.5R.How much does the internal (thermal) energy of the air change if its temperature rises from   To   (R = 8.31 J/mol ∙ K)  A) 35,800 J B) 430 J C) 3,580 J D) 8,940 J" class="answers-bank-image d-inline" rel="preload" >
(R = 8.31 J/mol ∙ K)

Accepted Answer

A)  35,800 J
B)  430 J
C)  3,580 J
D)  8,940 JE) A) and D)
F) None of the above

Question 15

When a gas expands adiabatically,

Accepted Answer

A)  the internal (thermal) energy of the gas decreases.
B)  the internal (thermal) energy of the gas increases.
C)  it does no work.
D)  work is done on the gas.
E)  the temperature of the gas remains constant.F) C) and D)
G) B) and D)

Question 16

What is the efficiency of an ideal Carnot engine operating between a reservoir in which ice and water coexist,and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atm for both reservoirs.

Accepted Answer

A)  27%
B)  0.27%
C)  100%
D)  1.0%
E)  15%F) A) and D)
G) C) and D) A

Question 17

A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at 25°C.Which of the following statements about these gases must be true? (There could be more than one correct choice. )

Accepted Answer

A)  The internal (thermal) energy of the gas in both flasks is the same.
B)  The internal (thermal) energy of the gas in the larger flask is greater than the internal (thermal) energy of the gas in the smaller flask.
C)  The internal (thermal) energy of the gas in the smaller flask is greater than the internal (thermal) energy of the gas in the larger flask.
D)  The molecules in the larger flask have the same root-mean-square speed as those in the smaller flask.
E)  The molecules in the smaller flask have the same average kinetic energy per molecule as those in the larger flask.F) A) and D)
G) C) and D)

Question 18

A refrigerator has a coefficient of performance equal to 4.2.How much work must be done on the operating gas in the refrigerator in order to remove 250 J of heat from the interior compartment?

Accepted Answer

A)  60 J
B)  120 J
C)  250 J
D)  480 J
E)  1050 JF) D) and E)
G) B) and C)

Question 19

An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat.What is the change in the internal (thermal) energy of the athlete?

Accepted Answer

A)  -225 kJ
B)  -1075 kJ
C)  1075 kJ
D)  225 kJ
E)  276 kJF) All of the above
G) A) and B)

Question 20

A container with rigid walls is filled with 4.00 mol of air at 17°C with CV = 2.5R.What is the final temperature of the air if its internal energy is increased by 28 kJ? (R = 8.31 J/mol ∙ K)

Accepted Answer

A)  337°C
B)  354°C
C)  337 K
D)  354 K
E)  610 KF) All of the above
G) B) and E)

Exam 18: The Laws of Thermodynamics

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the work done by the gas in the process?

Correct Answer
verified

Two ideal Carnot heat engines have the same efficiency.One operates between 5.0 × 10² K and 3.0 × 10² K,and the other between 4.0 × 10² K and some lower temperature.What is the lower temperature?

Correct Answer
verified

During an isochoric process,the internal (thermal) energy of a gas decreases by 50 J.How much heat is added to the gas during this process?

Correct Answer
verified

An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C.How much energy does it use to remove 2000 J of heat from the interior of the house?

Correct Answer
verified

The temperature of an ideal gas in a sealed rigid 0.60- Container is reduced from 460 K to The final pressure of the gas is The molar heat capacity at constant volume of the gas is 28.0 J/mol ∙ K.How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ∙ K)

Correct Answer
verified

A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K.This feat is accomplished by removing 400 J of energy from the gas.How much work is done by the gas during this process?

Correct Answer
verified

Correct Answer
verified

A certain ideal gas has a molar specific heat at constant volume 7R/2.What is its molar specific heat at constant pressure?

Correct Answer
verified
D

A heat pump absorbs heat from the atmosphere at a rate of 30 kW.If work is being done to run this heat pump at a rate of 7.7 kW,what is the coefficient of performance (COP) of the heat pump?

Correct Answer
verified

A heat engine having the maximum possible efficiency has an efficiency of 35.0% when operating between two heat reservoirs.If the temperature of the hot reservoir is 700 K,what is the temperature of the cold reservoir?

Correct Answer
verified

In a given reversible process,the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume.Which one of the following statements about the gas is correct?

Correct Answer
verified

During each cycle of operation,a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room.How much work input is required in each cycle?

Correct Answer
verified

An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at Has an efficiency of What is the temperature of the warm reservoir?

Correct Answer
verified
A

A rigid container is filled with 4.0 mol of air with C_V = 2.5R.How much does the internal (thermal) energy of the air change if its temperature rises from To (R = 8.31 J/mol ∙ K)

Correct Answer
verified

When a gas expands adiabatically,

Correct Answer
verified

What is the efficiency of an ideal Carnot engine operating between a reservoir in which ice and water coexist,and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atm for both reservoirs.

Correct Answer
verified
A

A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at 25°C.Which of the following statements about these gases must be true? (There could be more than one correct choice. )

Correct Answer
verified

A refrigerator has a coefficient of performance equal to 4.2.How much work must be done on the operating gas in the refrigerator in order to remove 250 J of heat from the interior compartment?

Correct Answer
verified

An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat.What is the change in the internal (thermal) energy of the athlete?

Correct Answer
verified

A container with rigid walls is filled with 4.00 mol of air at 17°C with C_V = 2.5R.What is the final temperature of the air if its internal energy is increased by 28 kJ? (R = 8.31 J/mol ∙ K)

Correct Answer
verified

Exam 18: The Laws of Thermodynamics

During an isothermal process,5.0 J of heat is removed from an ideal gas.What is the work done by the gas in the process?

Correct AnswerverifiedShow Answer

Two ideal Carnot heat engines have the same efficiency.One operates between 5.0 × 102 K and 3.0 × 102 K,and the other between 4.0 × 102 K and some lower temperature.What is the lower temperature?

Correct AnswerverifiedShow Answer

During an isochoric process,the internal (thermal) energy of a gas decreases by 50 J.How much heat is added to the gas during this process?

Correct AnswerverifiedShow Answer

An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C.How much energy does it use to remove 2000 J of heat from the interior of the house?

Correct AnswerverifiedShow Answer

The temperature of an ideal gas in a sealed rigid 0.60- Container is reduced from 460 K to The final pressure of the gas is The molar heat capacity at constant volume of the gas is 28.0 J/mol ∙ K.How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ∙ K)

Correct AnswerverifiedShow Answer

A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K.This feat is accomplished by removing 400 J of energy from the gas.How much work is done by the gas during this process?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A certain ideal gas has a molar specific heat at constant volume 7R/2.What is its molar specific heat at constant pressure?

Correct AnswerverifiedD

A heat pump absorbs heat from the atmosphere at a rate of 30 kW.If work is being done to run this heat pump at a rate of 7.7 kW,what is the coefficient of performance (COP) of the heat pump?

Correct AnswerverifiedShow Answer

A heat engine having the maximum possible efficiency has an efficiency of 35.0% when operating between two heat reservoirs.If the temperature of the hot reservoir is 700 K,what is the temperature of the cold reservoir?

Correct AnswerverifiedShow Answer

In a given reversible process,the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume.Which one of the following statements about the gas is correct?

Correct AnswerverifiedShow Answer

During each cycle of operation,a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room.How much work input is required in each cycle?

Correct AnswerverifiedShow Answer

An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at Has an efficiency of What is the temperature of the warm reservoir?

Correct AnswerverifiedA

A rigid container is filled with 4.0 mol of air with CV = 2.5R.How much does the internal (thermal) energy of the air change if its temperature rises from To (R = 8.31 J/mol ∙ K)

Correct AnswerverifiedShow Answer

When a gas expands adiabatically,

Correct AnswerverifiedShow Answer

What is the efficiency of an ideal Carnot engine operating between a reservoir in which ice and water coexist,and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atm for both reservoirs.

Correct AnswerverifiedA

A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at 25°C.Which of the following statements about these gases must be true? (There could be more than one correct choice. )

Correct AnswerverifiedShow Answer

A refrigerator has a coefficient of performance equal to 4.2.How much work must be done on the operating gas in the refrigerator in order to remove 250 J of heat from the interior compartment?

Correct AnswerverifiedShow Answer

An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat.What is the change in the internal (thermal) energy of the athlete?

Correct AnswerverifiedShow Answer

A container with rigid walls is filled with 4.00 mol of air at 17°C with CV = 2.5R.What is the final temperature of the air if its internal energy is increased by 28 kJ? (R = 8.31 J/mol ∙ K)

Correct AnswerverifiedShow Answer

Correct Answer
verified

Two ideal Carnot heat engines have the same efficiency.One operates between 5.0 × 10² K and 3.0 × 10² K,and the other between 4.0 × 10² K and some lower temperature.What is the lower temperature?

Correct Answer
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D

Correct Answer
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A

A rigid container is filled with 4.0 mol of air with C_V = 2.5R.How much does the internal (thermal) energy of the air change if its temperature rises from To (R = 8.31 J/mol ∙ K)

Correct Answer
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A

Correct Answer
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Correct Answer
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A container with rigid walls is filled with 4.00 mol of air at 17°C with C_V = 2.5R.What is the final temperature of the air if its internal energy is increased by 28 kJ? (R = 8.31 J/mol ∙ K)

Correct Answer
verified