Question 1

How much heat is required to vaporize 50.0 g of water if the initial temperature of the water is 25.0 ∘\circ∘ C and the water is heated to its boiling point, where it is converted to steam? The specific heat capacity of water is 4.18 J.( ∘\circ∘ C) -1g-1 and the standard enthalpy of vaporization of water at its boiling point is 40.7 kJ.mol-1.

Accepted Answer

A)   169 kJ
B)   64.2 kJ
C)   40.7 kJ
D)   193 kJ
E)   23.5 kJ F) A) and B)
G) All of the above

Question 2

Calculate the standard enthalpy of formation of bicyco[1.1.0]butane (shown below)  -1 ,Respectively,And the average C-H and C-C bond enthalpies,412 and 348 kJ.mol-1,Respectively. A)  +175 kJ.mol-1  B)  -472 kJ.mol-1  C)  +312 kJ.mol-1  D)  -36 kJ.mol-1  E)  -124 kJ.mol-1 " class="answers-bank-image d-inline" rel="preload" > given the standard enthalpies of formation of C(g) And H(g) ,717 and 218 kJ.mol-1 ,Respectively,And the average C-H and C-C bond enthalpies,412 and 348 kJ.mol-1,Respectively.

Accepted Answer

A)   +175 kJ.mol-1 
B)   -472 kJ.mol-1 
C)   +312 kJ.mol-1 
D)   -36 kJ.mol-1 
E)   -124 kJ.mol-1 F) C) and D)
G) B) and D)

Question 3

Which of the following is not a state function?

Accepted Answer

A)   H
B)   T
C)   U
D)   S
E)   None; they are all state functions.F) D) and E)
G) B) and D)

Question 4

Which of the following statements about ion formation is true?

Accepted Answer

A)   Enthalpy of ionization is the standard enthalpy for the gain of one or more electrons by an atom.
B)   The enthalpies of ionization are the kinetic versions of ionization energy.
C)   Enthalpies of ionization are numerically very different from values for electron gain.
D)   None of the above are true.E) C) and D)
F) None of the above

Question 5

A piece of a newly synthesized material of mass 12.0 g at 88.0 ο\omicron ο C is placed in a calorimeter containing 100.0 g of water at 20.0 ο\omicron ο C .If the final temperature of the system is 24.0 ο\omicron ο C,What is the specific heat capacity of this material?

Accepted Answer

A)   10.2 J.g-1.( ο\omicron ο 
C)  -1 
B)   1.58 J.g-1.( ο\omicron ο 
C)  -1 
C)   2.18 J.g-1.( ο\omicron ο 
C)  -1 
D)   9.50 J.g-1.( ο\omicron ο 
C)  -1 
E)   0.54 J.g-1.( ο\omicron ο 
C)  -1  F) C) and D)
G) A) and D)

Question 6

What is the total motional contribution to the molar internal energy of gaseous H2O at 25 ∘\circ∘ C?

Accepted Answer

A)   6.19 kJ.mol-1
B)   7.43 kJ.mol-1
C)   3.72 kJ.mol-1
D)   12.4 kJ.mol-1
E)   2.48 kJ.mol-1 F) B) and D)
G) None of the above

Question 7

How much work is done by a person of mass 185 kg who climbs a ladder to the top of his house, a total of 15.0 m?

Accepted Answer

A)   2.78 kJ
B)   12.3 kJ
C)   27.2 kJ
D)   No work is done.
E)   121 kJF) A) and E)
G) A) and B)

Question 8

Calculate the enthalpy change that occurs when 1.00 kg of acetone condenses at its boiling point (329.4 K)  .The standard enthalpy of vaporization of acetone is29.1 kJ.mol-1.

Accepted Answer

A)   -502 kJ
B)  -29.1 kJ
C)   -2.91 * 104 kJ
D)   +502 kJ
E)   +29.1 kJF) All of the above
G) C) and E)

Question 9

A CD player and its battery together do 500 kJ of work .The battery also releases 250 kJ of energy as heat and the CD player releases 50 kJ as heat due to friction from spinning.What is the change in internal energy of the system,
With the system regarded as the battery and CD player together?

Accepted Answer

A)   +200 kJ
B)   -700 kJ
C)   -800 kJ
D)   -200 kJ
E)   -750 kJF) B) and E)
G) A) and B)

Question 10

If the standard enthalpy of combustion of octane,
C8H18(l),at 298 K is -5471 kJ.mol-1 calculate the standard enthalpy of formation of octane.The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ.mol-1 ,respectively.

Accepted Answer

-249 kJ.mo...

Question 11

Calculate the lattice enthalpy of silver chloride from the following data.
Enthalpy of formation of Ag(g) : +284 kJ.mol-1 
First ionization energy of Ag(g) : +731 kJ.mol-1 
Enthalpy of formation of Cl(g) : +122 kJ.mol-1 
Electron affinity of Cl(g) : +349 ( Δ\DeltaΔ H = -349) 
kJ.mol-1 
Enthalpy of formation of AgCl(s) : -127 kJ.mol-1

Accepted Answer

A)   1613 kJ.mol-1 
B)   915 kJ.mol-1 
C)   1037 kJ.mol-1 
D)   1359 kJ.mol-1 
E)   661 kJ.mol-1  F) A) and C)
G) C) and D)

Question 12

The combustion of 1 mole of octane, C8H18(l) ,To produce carbon dioxide and liquid water has  Δ\DeltaΔ Hr = -5471 kJ.mol-1 at 298 K.What is the change in internal energy for this reaction?

Accepted Answer

A)   -5460 kJ.mol-1 
B)   -5482 kJ.mol-1 
C)   -5449 kJ.mol-1 
D)   -5471 kJ.mol-1 
E)   -5493 kJ.mol-1  F) A) and B)
G) A) and E)

Question 13

Consider the reaction
Cl2(g)  →\rightarrow→  2Cl(g) 
Which of the following statement regarding this reaction is true?

Accepted Answer

A)   The reaction is spontaneous at high temperatures.
B)   The reaction is spontaneous at low temperatures.
C)   The reaction is not spontaneous at any temperature.
D)   The reaction is spontaneous at all temperatures. E) B) and C)
F) C) and D)

Question 14

The combustion of 1 mole of ethanol, C2H5OH(l) ,To produce carbon dioxide and gaseous water has  Δ\DeltaΔ Hr = -1235 kJ.mol-1  at 298 K.What is the change in internal energy for this reaction?

Accepted Answer

A)   -1237 kJ.mol-1 
B)   -1240 kJ.mol-1 
C)   -1230 kJ.mol-1 
D)   -1247 kJ.mol-1 
E)   -1223 kJ.mol-1  F) None of the above
G) A) and B)

Question 15

What mass of ethanol, C2H5OH(l) ,Must be burned to supply 500 kJ of heat? The standard enthalpy of combustion of ethanol at 298 K is -1368 kJ.mol-1

Accepted Answer

A)   126 g
B)   2.74 g
C)   16.8 g
D)   10.9 g
E)   29.7 gF) All of the above
G) B) and E)

Question 16

Which of the following statements is true?

Accepted Answer

A)   Labile is a term that refers to the thermodynamic tendency of a substance to decompose.
B)   A thermodynamically unstable compound is a compound with a positive standard free energy of formation.
C)   Spontaneous reactions always have  Δ\DeltaΔ Sr ∘\circ∘  > 0.
D)   Spontaneous reactions always have  Δ\DeltaΔ Gr ∘\circ∘  > 0.
E)   Spontaneous reactions always have  Δ\DeltaΔ Hr ∘\circ∘ < 0. F) A) and E)
G) None of the above

Question 17

A reaction known to release 4.00 kJ of heat takes place in a calorimeter containing 0.200 L of solution and the temperature rose by 6.14 ο\omicron ο C .When 200 mL of hydrochloric acid was added to a small piece of calcium carbonate in the same calorimeter,The temperature rose by 4.25 ο\omicron ο C.What is the heat output for this reaction?

Accepted Answer

A)   0.0257k.J.( ο\omicron ο 
C)  -1 
B)   0.941 k.J.( ο\omicron ο 
C)  -1 
C)   0.651 k.J.( ο\omicron ο 
C)  -1 
D)   2.77 k.J.( ο\omicron ο 
C)  -1 
E)   2.12 k.J.( ο\omicron ο 
C)  -1  F) C) and D)
G) B) and E)

Question 18

If 2.00 mol of an ideal gas at 300 K and 3.00 atm expands from 6.00 L to 18.00 L and has a final pressure of 1.20 atm, isothermally and reversibly, Which of the following is correct?

Accepted Answer

A)   w = -5.48 kJ, q = +5.48 kJ,  Δ\DeltaΔ U = 0
B)   w = -3.65 kJ, q = +3.65 kJ,  Δ\DeltaΔ U = 0
C)   w = +3.65 kJ, q = +3.65 kJ,  Δ\DeltaΔ U = +7.30 kJ
D)   w = -5.48 kJ, q = -5.48 kJ,  Δ\DeltaΔ U = -11.0 kJ
E)   w = +5.48 kJ, q = +5.48 kJ,  Δ\DeltaΔ U = +11.0 kJ F) A) and E)
G) B) and E)

Question 19

Which of the following would probably have a positive  Δ\DeltaΔ S value?

Accepted Answer

A)   He(g, 2 atm)   →\rarr→  He(g, 10 atm) 
B)   H2(g)  + I2(s)   →\rarr→  2HI(g) 
C)   2Ag(s)  + Br2(l)   →\rarr→  2AgBr(s) 
D)   O2(g)   →\rarr→  O2(aq) 
E)   2NO2(g)   →\rarr→  N2O4(g)  F) A) and E)
G) A) and C)

Question 20

What type of process is the formation of solid magnesium chloride from a gas of its ions?

Accepted Answer

A)   a state function
B)   an adiabatic process
C)   an endothermic process
D)   an exothermic process
E)   not enough information is given to permit an answerF) None of the above
G) A) and D)

Exam 4: Thermodynamics

Which of the following is not a state function?

Correct Answer
verified

Which of the following would probably have a positive $\Delta$ S value?

Correct Answer
verified

Which of the following statements about ion formation is true?

Correct Answer
verified

If the standard enthalpy of combustion of octane, C₈H₁₈(l),at 298 K is -5471 kJ.mol^-¹calculate the standard enthalpy of formation of octane.The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ.mol^-¹,respectively.

Correct Answer
verified
-249 kJ.mo...
View Answer

A piece of a newly synthesized material of mass 12.0 g at 88.0^$\omicron$C is placed in a calorimeter containing 100.0 g of water at 20.0^$\omicron$C .If the final temperature of the system is 24.0^$\omicron$C,What is the specific heat capacity of this material?

Correct Answer
verified

The combustion of 1 mole of octane, C₈H₁₈(l) ,To produce carbon dioxide and liquid water has $\Delta$ H_r = -5471 kJ.mol^-¹at 298 K.What is the change in internal energy for this reaction?

Correct Answer
verified

What type of process is the formation of solid magnesium chloride from a gas of its ions?

Correct Answer
verified

What mass of ethanol, C₂H₅OH(l) ,Must be burned to supply 500 kJ of heat? The standard enthalpy of combustion of ethanol at 298 K is -1368 kJ.mol^-¹

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the total motional contribution to the molar internal energy of gaseous H₂O at 25^$\circ$C?

Correct Answer
verified

A CD player and its battery together do 500 kJ of work .The battery also releases 250 kJ of energy as heat and the CD player releases 50 kJ as heat due to friction from spinning.What is the change in internal energy of the system, With the system regarded as the battery and CD player together?

Correct Answer
verified

Calculate the standard enthalpy of formation of bicyco[1.1.0]butane (shown below) given the standard enthalpies of formation of C(g) And H(g) ,717 and 218 kJ.mol^-¹,Respectively,And the average C-H and C-C bond enthalpies,412 and 348 kJ.mol^-1,Respectively.

Correct Answer
verified

If 2.00 mol of an ideal gas at 300 K and 3.00 atm expands from 6.00 L to 18.00 L and has a final pressure of 1.20 atm, isothermally and reversibly, Which of the following is correct?

Correct Answer
verified

How much work is done by a person of mass 185 kg who climbs a ladder to the top of his house, a total of 15.0 m?

Correct Answer
verified

Which of the following statements is true?

Correct Answer
verified

The combustion of 1 mole of ethanol, C₂H₅OH(l) ,To produce carbon dioxide and gaseous water has $\Delta$ H_r = -1235 kJ.mol^-¹ at 298 K.What is the change in internal energy for this reaction?

Correct Answer
verified

Calculate the enthalpy change that occurs when 1.00 kg of acetone condenses at its boiling point (329.4 K) .The standard enthalpy of vaporization of acetone is29.1 kJ.mol^-¹.

Correct Answer
verified

Correct Answer
verified

Consider the reaction Cl₂(g) $\rightarrow$ 2Cl(g) Which of the following statement regarding this reaction is true?

Correct Answer
verified

Exam 4: Thermodynamics

Which of the following is not a state function?

Correct AnswerverifiedShow Answer

Which of the following would probably have a positive Δ\DeltaΔ S value?

Correct AnswerverifiedShow Answer

Which of the following statements about ion formation is true?

Correct AnswerverifiedShow Answer

If the standard enthalpy of combustion of octane, C8H18(l),at 298 K is -5471 kJ.mol-1 calculate the standard enthalpy of formation of octane.The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ.mol-1 ,respectively.

Correct Answerverified-249 kJ.mo...View AnswerShow Answer

A piece of a newly synthesized material of mass 12.0 g at 88.0 ο\omicron ο C is placed in a calorimeter containing 100.0 g of water at 20.0 ο\omicron ο C .If the final temperature of the system is 24.0 ο\omicron ο C,What is the specific heat capacity of this material?

Correct AnswerverifiedShow Answer

The combustion of 1 mole of octane, C8H18(l) ,To produce carbon dioxide and liquid water has Δ\DeltaΔ Hr = -5471 kJ.mol-1 at 298 K.What is the change in internal energy for this reaction?

Correct AnswerverifiedShow Answer

What type of process is the formation of solid magnesium chloride from a gas of its ions?

Correct AnswerverifiedShow Answer

What mass of ethanol, C2H5OH(l) ,Must be burned to supply 500 kJ of heat? The standard enthalpy of combustion of ethanol at 298 K is -1368 kJ.mol-1

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the total motional contribution to the molar internal energy of gaseous H2O at 25 ∘\circ∘ C?

Correct AnswerverifiedShow Answer

A CD player and its battery together do 500 kJ of work .The battery also releases 250 kJ of energy as heat and the CD player releases 50 kJ as heat due to friction from spinning.What is the change in internal energy of the system, With the system regarded as the battery and CD player together?

Correct AnswerverifiedShow Answer

Calculate the standard enthalpy of formation of bicyco[1.1.0]butane (shown below) given the standard enthalpies of formation of C(g) And H(g) ,717 and 218 kJ.mol-1 ,Respectively,And the average C-H and C-C bond enthalpies,412 and 348 kJ.mol-1,Respectively.

Correct AnswerverifiedShow Answer

If 2.00 mol of an ideal gas at 300 K and 3.00 atm expands from 6.00 L to 18.00 L and has a final pressure of 1.20 atm, isothermally and reversibly, Which of the following is correct?

Correct AnswerverifiedShow Answer

How much work is done by a person of mass 185 kg who climbs a ladder to the top of his house, a total of 15.0 m?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

The combustion of 1 mole of ethanol, C2H5OH(l) ,To produce carbon dioxide and gaseous water has Δ\DeltaΔ Hr = -1235 kJ.mol-1 at 298 K.What is the change in internal energy for this reaction?

Correct AnswerverifiedShow Answer

Calculate the enthalpy change that occurs when 1.00 kg of acetone condenses at its boiling point (329.4 K) .The standard enthalpy of vaporization of acetone is29.1 kJ.mol-1.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider the reaction Cl2(g) →\rightarrow→ 2Cl(g) Which of the following statement regarding this reaction is true?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Which of the following would probably have a positive $\Delta$ S value?

Correct Answer
verified

Correct Answer
verified

If the standard enthalpy of combustion of octane, C₈H₁₈(l),at 298 K is -5471 kJ.mol^-¹calculate the standard enthalpy of formation of octane.The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ.mol^-¹,respectively.

Correct Answer
verified
-249 kJ.mo...
View Answer

A piece of a newly synthesized material of mass 12.0 g at 88.0^$\omicron$C is placed in a calorimeter containing 100.0 g of water at 20.0^$\omicron$C .If the final temperature of the system is 24.0^$\omicron$C,What is the specific heat capacity of this material?

Correct Answer
verified

The combustion of 1 mole of octane, C₈H₁₈(l) ,To produce carbon dioxide and liquid water has $\Delta$ H_r = -5471 kJ.mol^-¹at 298 K.What is the change in internal energy for this reaction?

Correct Answer
verified

Correct Answer
verified

What mass of ethanol, C₂H₅OH(l) ,Must be burned to supply 500 kJ of heat? The standard enthalpy of combustion of ethanol at 298 K is -1368 kJ.mol^-¹

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the total motional contribution to the molar internal energy of gaseous H₂O at 25^$\circ$C?

Correct Answer
verified

Correct Answer
verified

Calculate the standard enthalpy of formation of bicyco[1.1.0]butane (shown below) given the standard enthalpies of formation of C(g) And H(g) ,717 and 218 kJ.mol^-¹,Respectively,And the average C-H and C-C bond enthalpies,412 and 348 kJ.mol^-1,Respectively.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The combustion of 1 mole of ethanol, C₂H₅OH(l) ,To produce carbon dioxide and gaseous water has $\Delta$ H_r = -1235 kJ.mol^-¹ at 298 K.What is the change in internal energy for this reaction?

Correct Answer
verified

Calculate the enthalpy change that occurs when 1.00 kg of acetone condenses at its boiling point (329.4 K) .The standard enthalpy of vaporization of acetone is29.1 kJ.mol^-¹.

Correct Answer
verified

Correct Answer
verified

Consider the reaction Cl₂(g) $\rightarrow$ 2Cl(g) Which of the following statement regarding this reaction is true?

Correct Answer
verified