Question 1

Calculate E for a system that releases 32 J of heat while 56 J of work is done on it.

Accepted Answer

A)   32 J
B)   88 J
C)   24 J
D)   -88 J
E)   -24 JF) A) and E)
G) None of the above

Question 2

Acetylene (C2H2) and butane (C4H10) are gaseous fuels. Determine the ratio of energy available from the combustion of a given volume of acetylene to butane at the same temperature and pressure using the following data:
The change in enthalpy of combustion for C2H2(g) = -49.9 kJ/g.
The change in enthalpy of combustion for C4H10 = -49.5 kJ/g.

Accepted Answer

The energy available from the ...

Question 3

When a student performs an endothermic reaction in a calorimeter, how (if any)  does the calculated value of H differ from the actual value if the heat exchanged with the calorimeter is not taken into account?

Accepted Answer

A)   (Hcalc)  is less positive because the reaction absorbs heat from the calorimeter.
B)   (Hcalc)  equals the actual value because the calorimeter does not absorb heat.
C)   (Hcalc)  is more negative because the calorimeter always absorbs heat from the reaction.
D)   (Hcalc)  is less negative because the calorimeter absorbs heat from the reaction.
E)   (Hcalc)  is more positive because the reaction absorbs heat from the calorimeter.F) C) and E)
G) None of the above

Question 4

The total volume of hydrogen gas needed to fill the Hindenburg was 2.00  108 L at 1.00 atm and 25.0°C. How much energy was evolved when it burned? H2(g)  + (1/2) O2(g)   H2O(l) , H = -286 kJ

Accepted Answer

A)   8.18  106 kJ
B)   3.5  1011 kJ
C)   2.86  104 kJ
D)   5.72  1010 kJ
E)   2.34  109 kJF) C) and D)
G) A) and E)

Question 5

The combustion of methanol takes place according to the reaction 2CH3OH(l)  + 3O2(g)   2CO2(g)  + 4H2O(l) 
Calculate H for the combustion of 1 mol of methanol under standard conditions. Use the following standard enthalpies of formation: 3OH(l)  + 3O2(g)   2CO2(g)  + 4H2O(l)  Calculate H for the combustion of 1 mol of methanol under standard conditions. Use the following standard enthalpies of formation:   A)  -1452.4 kJ/mol B)  +1452.4 kJ/mol C)  -726.2 kJ/mol D)  +726.2 kJ/mol E)  none of these " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -1452.4 kJ/mol
B)   +1452.4 kJ/mol
C)   -726.2 kJ/mol
D)   +726.2 kJ/mol
E)   none of theseF) A) and B)
G) A) and C)

Question 6

Consider a gas in a 1.0-L bulb at STP that is connected via a valve to another bulb that is initially evacuated. Answer the following questions about what occurs when the valve between the two bulbs is opened.
-What is true about the value of w?

Accepted Answer

A)   It is less than zero.
B)   It is equal to zero.
C)   It is greater than zero.D) A) and C)
E) None of the above

Question 7

The standard state of carbon as a free element is graphite. C60 is an allotropic form of carbon belonging to a class of structures known as fullerenes. 60 is an allotropic form of carbon belonging to a class of structures known as fullerenes.   for C60 should be A)  zero B)  positive C)  negative D)  equal to   for the other allotropic forms of carbon E)  A and D " class="answers-bank-image d-inline" rel="preload" > for C60 should be

Accepted Answer

A)   zero
B)   positive
C)   negative
D)   equal to 60 is an allotropic form of carbon belonging to a class of structures known as fullerenes.   for C60 should be 
A)   zero 
B)   positive 
C)   negative 
D)   equal to   for the other allotropic forms of carbon 
E)   A and D " class="answers-bank-image d-inline" rel="preload" > for the other allotropic forms of carbon
E)   A and DF) A) and B)
G) None of the above

Question 8

Two samples of a monatomic ideal gas are in separate containers at the same conditions of pressure, volume, and temperature (V = 1.00 L and P = 1.00 atm) . Both samples undergo changes in conditions and finish with V = 2.00 L and P = 2.00 atm. However, in the first sample, the volume is changed to 2.0 L while the pressure is kept constant, and then the pressure is increased to 2.00 atm while the volume remains constant. In the second sample, the opposite is done. The pressure is increased first, with constant volume, and then the volume is increased under constant pressure.
-Calculate the difference in E between the first sample and the second sample.

Accepted Answer

A)   0
B)   1.00 L•atm
C)   2.00 L•atm
D)   4.50 L•atm
E)   none of theseF) A) and E)
G) A) and D)

Question 9

Standard enthalpies of formation are tabulated on a

Accepted Answer

A)   volume basis.
B)   mass basis.
C)   pressure basis.
D)   mole basis.E) None of the above
F) B) and C)

Question 10

Specific heat capacities are tabulated on a

Accepted Answer

A)   mass basis.
B)   volume basis.
C)   pressure basis.
D)   mole basis.E) None of the above
F) C) and D)

Question 11

Consider a gas in a 1.0-L bulb at STP that is connected via a valve to another bulb that is initially evacuated. Answer the following questions about what occurs when the valve between the two bulbs is opened.
-What is true about the value of E?

Accepted Answer

A)   It is less than zero.
B)   It is greater than zero.
C)   It is equal to zero.D) A) and B)
E) A) and C)

Question 12

Choose the correct equation for the standard enthalpy of formation of CO(g) , where H°f for CO = -110.5 kJ/mol.

Accepted Answer

A)   Cgraphite(s)  + CO2(g)   2CO(g) , H° = -110.5 kJ
B)   Cgraphite(s)  + O(g)   CO(g) , H° = -110.5 kJ
C)   2Cgraphite(s)  + O2(g)   2CO(g) , H° = -110.5 kJ
D)   H°f for CO = -110.5 kJ/mol. 
A)   Cgraphite(s)  + CO2(g)   2CO(g) , H° = -110.5 kJ 
B)   Cgraphite(s)  + O(g)   CO(g) , H° = -110.5 kJ 
C)   2Cgraphite(s)  + O2(g)   2CO(g) , H° = -110.5 kJ 
D)     , H° = -110.5 kJ 
E)   CO(g)   Cgraphite(s)  + O(g) , H° = -110.5 kJ " class="answers-bank-image d-inline" rel="preload" > , H° = -110.5 kJ
E)   CO(g)   Cgraphite(s)  + O(g) , H° = -110.5 kJF) C) and D)
G) A) and B)

Question 13

75.0 mL of a pure liquid at 245 K is mixed with 100.0 mL of the same pure liquid at 365. K. What is the final temperature of the mixture?

Accepted Answer

A)   325 K
B)   295 K
C)   305 K
D)   314 K
E)   none of theseF) B) and C)
G) C) and E)

Question 14

One mole of a liquid is vaporized at its boiling point, 65°C and 1.00 atm. Hvap for the liquid is 43.8 kJ/mol at 65° C.
-Calculate E.

Accepted Answer

A)   71.5 kJ
B)   16.1 kJ
C)   41.0 kJ
D)   46.6 kJ
E)   none of theseF) D) and E)
G) A) and D)

Question 15

Two metals of equal mass with different heat capacities are subjected to the same amount of heat. Which undergoes the smaller change in temperature?

Accepted Answer

A)   To determine this, you need to know which metals you are talking about.
B)   Both undergo the same change in temperature.
C)   The metal with the higher heat capacity.
D)   The metal with the lower heat capacity.
E)   To determine this, you need to know the initial temperatures of the metals.F) A) and D)
G) A) and E)

Question 16

Which one of the following statements is false?

Accepted Answer

A)   If qp for a process is negative, the process is exothermic.
B)   A bomb calorimeter measures H directly.
C)   The change in enthalpy, H, for a process is equal to the amount of heat absorbed at constant pressure, qp.
D)   The freezing of water is an example of an exothermic reaction.
E)   The change in internal energy, E, for a process is equal to the amount of heat absorbed at constant volume, qv.F) A) and E)
G) C) and E)

Question 17

For a particular process q = -10 kJ and w = 25 kJ. Which of the following statements is true?

Accepted Answer

A)   The system does work on the surroundings.
B)   Heat flows from the surroundings to the system.
C)   (E = -35 kJ) 
D)   All of these are true.
E)   None of these is true.F) D) and E)
G) B) and C)

Question 18

Which of the following statements is true for a monatomic ideal gas?

Accepted Answer

A)   
B)   
C)   
D)   
E)    is temperature dependentF)   B  and  C G)   A, D , and  E H) A) and E)
I) D) and E)

Question 19

Two samples of a monatomic ideal gas are in separate containers at the same conditions of pressure, volume, and temperature (V = 1.00 L and P = 1.00 atm) . Both samples undergo changes in conditions and finish with V = 2.00 L and P = 2.00 atm. However, in the first sample, the volume is changed to 2.0 L while the pressure is kept constant, and then the pressure is increased to 2.00 atm while the volume remains constant. In the second sample, the opposite is done. The pressure is increased first, with constant volume, and then the volume is increased under constant pressure.
-Calculate the difference in w between the first sample and the second sample.

Accepted Answer

A)   -2.00 L•atm
B)   1.00 L•atm
C)   2.00 L•atm
D)   -1.00 L•atm
E)   none of theseF) A) and B)
G) A) and C)

Question 20

A bomb calorimeter has a heat capacity of 2.24 kJ/K. When a 0.170 g sample of gas with a molar mass of 28.0 g/mol was burned in this calorimeter, the temperature increased by 2.19 K. Calculate the energy of combustion for 1 mol of this gas.

Accepted Answer

A)   -4.91 kJ
B)   -0.0298 kJ
C)   -8.08  102 kJ
D)   -1.37  102 kJ
E)   -2.89  101 kJF) C) and E)
G) B) and D)

Exam 9: Energy, Enthalpy, and Thermochemistry

75.0 mL of a pure liquid at 245 K is mixed with 100.0 mL of the same pure liquid at 365. K. What is the final temperature of the mixture?

Correct Answer
verified

Calculate E for a system that releases 32 J of heat while 56 J of work is done on it.

Correct Answer
verified

Correct Answer
verified
The energy available from the ...
View Answer

Choose the correct equation for the standard enthalpy of formation of CO(g) , where H°_f for CO = -110.5 kJ/mol.

Correct Answer
verified

One mole of a liquid is vaporized at its boiling point, 65°C and 1.00 atm. H_vap for the liquid is 43.8 kJ/mol at 65° C. -Calculate E.

Correct Answer
verified

The combustion of methanol takes place according to the reaction 2CH₃OH(l) + 3O₂(g)  2CO₂(g) + 4H₂O(l) Calculate H for the combustion of 1 mol of methanol under standard conditions. Use the following standard enthalpies of formation:

Correct Answer
verified

Correct Answer
verified

Consider a gas in a 1.0-L bulb at STP that is connected via a valve to another bulb that is initially evacuated. Answer the following questions about what occurs when the valve between the two bulbs is opened. -What is true about the value of E?

Correct Answer
verified

Correct Answer
verified

A bomb calorimeter has a heat capacity of 2.24 kJ/K. When a 0.170 g sample of gas with a molar mass of 28.0 g/mol was burned in this calorimeter, the temperature increased by 2.19 K. Calculate the energy of combustion for 1 mol of this gas.

Correct Answer
verified

Two metals of equal mass with different heat capacities are subjected to the same amount of heat. Which undergoes the smaller change in temperature?

Correct Answer
verified

When a student performs an endothermic reaction in a calorimeter, how (if any) does the calculated value of H differ from the actual value if the heat exchanged with the calorimeter is not taken into account?

Correct Answer
verified

For a particular process q = -10 kJ and w = 25 kJ. Which of the following statements is true?

Correct Answer
verified

The total volume of hydrogen gas needed to fill the Hindenburg was 2.00  10⁸ L at 1.00 atm and 25.0°C. How much energy was evolved when it burned? H₂(g) + (1/2) O₂(g)  H₂O(l) , H = -286 kJ

Correct Answer
verified

Specific heat capacities are tabulated on a

Correct Answer
verified

Standard enthalpies of formation are tabulated on a

Correct Answer
verified

The standard state of carbon as a free element is graphite. C₆₀ is an allotropic form of carbon belonging to a class of structures known as fullerenes. for C₆₀ should be

Correct Answer
verified

Which one of the following statements is false?

Correct Answer
verified

Which of the following statements is true for a monatomic ideal gas?

Correct Answer
verified

Consider a gas in a 1.0-L bulb at STP that is connected via a valve to another bulb that is initially evacuated. Answer the following questions about what occurs when the valve between the two bulbs is opened. -What is true about the value of w?

Correct Answer
verified

Exam 9: Energy, Enthalpy, and Thermochemistry

75.0 mL of a pure liquid at 245 K is mixed with 100.0 mL of the same pure liquid at 365. K. What is the final temperature of the mixture?

Correct AnswerverifiedShow Answer

Calculate E for a system that releases 32 J of heat while 56 J of work is done on it.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThe energy available from the ...View AnswerShow Answer

Choose the correct equation for the standard enthalpy of formation of CO(g) , where H°f for CO = -110.5 kJ/mol.

Correct AnswerverifiedShow Answer

One mole of a liquid is vaporized at its boiling point, 65°C and 1.00 atm. Hvap for the liquid is 43.8 kJ/mol at 65° C. -Calculate E.

Correct AnswerverifiedShow Answer

The combustion of methanol takes place according to the reaction 2CH3OH(l) + 3O2(g)  2CO2(g) + 4H2O(l) Calculate H for the combustion of 1 mol of methanol under standard conditions. Use the following standard enthalpies of formation:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider a gas in a 1.0-L bulb at STP that is connected via a valve to another bulb that is initially evacuated. Answer the following questions about what occurs when the valve between the two bulbs is opened. -What is true about the value of E?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A bomb calorimeter has a heat capacity of 2.24 kJ/K. When a 0.170 g sample of gas with a molar mass of 28.0 g/mol was burned in this calorimeter, the temperature increased by 2.19 K. Calculate the energy of combustion for 1 mol of this gas.

Correct AnswerverifiedShow Answer

Two metals of equal mass with different heat capacities are subjected to the same amount of heat. Which undergoes the smaller change in temperature?

Correct AnswerverifiedShow Answer

When a student performs an endothermic reaction in a calorimeter, how (if any) does the calculated value of H differ from the actual value if the heat exchanged with the calorimeter is not taken into account?

Correct AnswerverifiedShow Answer

For a particular process q = -10 kJ and w = 25 kJ. Which of the following statements is true?

Correct AnswerverifiedShow Answer

The total volume of hydrogen gas needed to fill the Hindenburg was 2.00  108 L at 1.00 atm and 25.0°C. How much energy was evolved when it burned? H2(g) + (1/2) O2(g)  H2O(l) , H = -286 kJ

Correct AnswerverifiedShow Answer

Specific heat capacities are tabulated on a

Correct AnswerverifiedShow Answer

Standard enthalpies of formation are tabulated on a

Correct AnswerverifiedShow Answer

The standard state of carbon as a free element is graphite. C60 is an allotropic form of carbon belonging to a class of structures known as fullerenes. for C60 should be

Correct AnswerverifiedShow Answer

Which one of the following statements is false?

Correct AnswerverifiedShow Answer

Which of the following statements is true for a monatomic ideal gas?

Correct AnswerverifiedShow Answer

Consider a gas in a 1.0-L bulb at STP that is connected via a valve to another bulb that is initially evacuated. Answer the following questions about what occurs when the valve between the two bulbs is opened. -What is true about the value of w?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The energy available from the ...
View Answer

Choose the correct equation for the standard enthalpy of formation of CO(g) , where H°_f for CO = -110.5 kJ/mol.

Correct Answer
verified

One mole of a liquid is vaporized at its boiling point, 65°C and 1.00 atm. H_vap for the liquid is 43.8 kJ/mol at 65° C. -Calculate E.

Correct Answer
verified

The combustion of methanol takes place according to the reaction 2CH₃OH(l) + 3O₂(g)  2CO₂(g) + 4H₂O(l) Calculate H for the combustion of 1 mol of methanol under standard conditions. Use the following standard enthalpies of formation:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The total volume of hydrogen gas needed to fill the Hindenburg was 2.00  10⁸ L at 1.00 atm and 25.0°C. How much energy was evolved when it burned? H₂(g) + (1/2) O₂(g)  H₂O(l) , H = -286 kJ

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The standard state of carbon as a free element is graphite. C₆₀ is an allotropic form of carbon belonging to a class of structures known as fullerenes. for C₆₀ should be

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified