Question 1

The reaction 
2Cu(s)+ CO2(g)$\rightarrow$ 2CuO(s)+ C(s)
Is endothermic.Which of the following statements is true?

Accepted Answer

A) The reaction is not spontaneous at any temperature. 
B) The reaction is spontaneous at all temperatures. 
C) It is impossible to determine if the reaction is spontaneous without calculations. 
D) The reaction will be spontaneous only at low temperatures. 
E) The reaction will be spontaneous only at high temperatures.

Question 2

The standard reaction free energy for the oxidation of glucose is -2879 kJ·mol^-1.What is the maximum nonexpansion work obtainable from 125 g glucose,C₆H₁₂O₆(s)?

Accepted Answer

The answer of The standard reaction free energy for the...

Question 3

Consider the compounds 
PCl5(g),HCN(g),CuO(s),NO(g),NH3(g),and SO2(g).
Which compound will have approximately the same stability with respect to its elements if the temperature is raised?

Accepted Answer

A) CuO(s) 
B) NO(g) 
C) PCl5(g) 
D) HCN(g) 
E) NH3(g)

Question 4

Calculate the standard free energy of formation of mercury(II)oxide at 298 K,given

Accepted Answer

A) +58.5 kJ.mol-1  
B) +117.1 kJ.mol-1  
C) -58.5 kJ.mol-1  
D) -123.1 kJ.mol-1  
E) -117.1 kJ.mol-1

Question 5

Which of the following has the lowest standard molar entropy?

Accepted Answer

A) C(graphite) 
B) P4(s) 
C) S8(s) 
D) C60(s) 
E) C(diamond)

Question 6

The temperature of 2.00 mol Ne(g)is increased from 25S1U1P1$\circ$S1S1P0C to 200S1U1P1$\circ$S1S1P0C at constant pressure.Calculate the change in the entropy of neon (assume ideal behavior).

Accepted Answer

A) +7.68 J.K-1  
B) +19.2 J.K-1  
C) (-7.68 J.K-1 ) 
D) (-19.2 J.K-1 ) 
E) +9.60 J.K-1

Question 7

Consider the following processes (treat all gases as ideal).
1.The pressure of 1 mol of oxygen gas is allowed to double isothermally.
2.Carbon dioxide is allowed to expand isothermally to 10 times its original volume.
3.The temperature of 1 mol of helium is increased 25°C at constant pressure.
4.Nitrogen gas is compressed isothermally to half its original volume.
5.A glass of water loses 100 J of energy reversibly at 30°C.
Which of these processes lead(s) to a decrease in entropy?

Accepted Answer

A) 1 and 2 
B) 2 
C) 3 and 4 
D) 1,4,and 5 
E) 1 and 3

Question 8

Calculate the change in entropy of a large pail of water after 200 J of energy is reversibly transferred to the water at 20S1U1P1$\circ$S1S1P0C.

Accepted Answer

A) (-0.733 J.K-1 ) 
B) (+0.683 J.K-1 ) 
C) (-0.683 J.K-1 ) 
D) (+0.733 J.K-1 ) 
E) (-200 J.K-1 )

Question 9

The reaction 2C(s)+ 2H2(g)$\rightarrow$C2H4(g)is endothermic.This reaction will not be spontaneous at any temperature.

Accepted Answer

A) True 
 B)False

Question 10

All the following compounds become less stable with respect to their elements as the temperature is raised except

Accepted Answer

A) PCl5(g). 
B) C6H12(l). 
C) N2H4(l). 
D) CuO(s). 
E) HCN(g).

Question 11

Which one 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) Spontaneous reactions always have $\Delta$GrS1U1P1$\circ$S1S1P0 > 0. 
C) Spontaneous reactions always have $\Delta$HrS1U1P1$\circ$S1S1P0 rS1U1P1$\circ$S1S1P0 > 0. 
E) A thermodynamically stable compound is a compound with a negative standard free energy of formation.

Question 12

Which of the following statements is true?

Accepted Answer

A) If a reaction has $\Delta$GrS1U1P1$\circ$S1S1P0 = -275 kJ.mol-1,it must proceed rapidly toward equilibrium. 
B) All endothermic reactions are nonspontaneous. 
C) The value of $\Delta$GrS1U1P1$\circ$S1S1P0 is not dependent on temperature. 
D) A spontaneous reaction for which the entropy change is negative is entropy driven. 
E) If a certain reaction is spontaneous,it is not spontaneous in the reverse direction.

Question 13

When calculating the entropy of vaporization of water at 25S1U1P1$\circ$S1S1P0C,the dominant contribution is

Accepted Answer

A) the molar heat capacity of liquid water. 
B) heating the water from 25S1U1P1$\circ$S1S1P0C to 100S1U1P1$\circ$S1S1P0C. 
C) cooling the water from 100S1U1P1$\circ$S1S1P0C to 25S1U1P1$\circ$S1S1P0C. 
D) the entropy of vaporization of water at its normal boiling point.

Question 14

The enthalpy of fusion of H2O(s)at its normal melting point is 6.01 kJ.mol-1.The entropy change for freezing 1 mol of water at this temperature is

Accepted Answer

A) +20.2 J.K-1.mol-1  
B) 0 J.K-1.mol-1  
C) (-20.2 J.K-1.mol-1 ) 
D) +22.0 J.K-1.mol-1  
E) (-22.0 J.K-1.mol-1 )

Question 15

All entropies of fusion are positive.

Accepted Answer

A) True 
 B)False

Question 16

Reactions with positive values of $\Delta$Sro always become spontaneous at low temperatures.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following reactions has the smallest value of $\Delta$SS1U1P1$\circ$S1S1P0?

Accepted Answer

A) NH3(g)+ HCl(g)$\rightarrow$  NH4Cl(s) 
B) 2H2(l)+ O2(l)$\rightarrow$  2H2O(g) 
C) N2(g)+ 3H2(g)$\rightarrow$  2NH3(g) 
D) K(s)+ O2(g)$\rightarrow$ KO2(s) 
E) BaCl2.2H2O(s)$\rightarrow$  BaCl2(s)+ 2H2O(g)

Question 18

Which of the following has the smallest molar entropy?

Accepted Answer

A) C(diamond) 
B) C60(s) 
C) CaCO3(s) 
D) CO2(s) 
E) C(graphite)

Question 19

Under what conditions (e.g.,constant P)are the following relations true?
(a)$\Delta$G = $\Delta$H - T$\Delta$S
(b)q = $\Delta$H

Accepted Answer

The answer of Under what conditions (e.g.,constant P)are the following...

Question 20

Calculate $\Delta$GrS1U1P1$\circ$S1S1P0 for the decomposition of mercury(II)oxide at 298 K.

Accepted Answer

A) -117.1 kJ.mol-1  
B) +246.2 kJ.mol-1  
C) -64.5 kJ.mol-1  
D) +117.1 kJ.mol-1  
E) -246.2 kJ.mol-1

Exam 9: Thermodynamics: The Second and Third Laws

The reaction 2Cu(s) + CO₂(g) $\rightarrow$ 2CuO(s) + C(s) Is endothermic.Which of the following statements is true?

The standard reaction free energy for the oxidation of glucose is -2879 kJ·mol^-1.What is the maximum nonexpansion work obtainable from 125 g glucose,C₆H₁₂O₆(s)?

Consider the compounds PCl₅(g) ,HCN(g) ,CuO(s) ,NO(g) ,NH₃(g) ,and SO₂(g) . Which compound will have approximately the same stability with respect to its elements if the temperature is raised?

Calculate the standard free energy of formation of mercury(II) oxide at 298 K,given

Which of the following has the lowest standard molar entropy?

The temperature of 2.00 mol Ne(g) is increased from 25^$\circ$C to 200^$\circ$C at constant pressure.Calculate the change in the entropy of neon (assume ideal behavior) .

Calculate the change in entropy of a large pail of water after 200 J of energy is reversibly transferred to the water at 20^$\circ$C.

The reaction 2C(s)+ 2H₂(g) $\rightarrow$ C₂H₄(g)is endothermic.This reaction will not be spontaneous at any temperature.

All the following compounds become less stable with respect to their elements as the temperature is raised except

Which one of the following statements is true?

Which of the following statements is true?

When calculating the entropy of vaporization of water at 25^$\circ$C,the dominant contribution is

The enthalpy of fusion of H₂O(s) at its normal melting point is 6.01 kJ.mol^-1.The entropy change for freezing 1 mol of water at this temperature is

All entropies of fusion are positive.

Reactions with positive values of $\Delta$ S_r^o always become spontaneous at low temperatures.

Which of the following reactions has the smallest value of $\Delta$ S^$\circ$?

Which of the following has the smallest molar entropy?

Under what conditions (e.g.,constant P)are the following relations true? (a) $\Delta$ G = $\Delta$ H - T $\Delta$ S (b)q = $\Delta$ H

Exam 9: Thermodynamics: The Second and Third Laws

The reaction 2Cu(s) + CO2(g) →\rightarrow→ 2CuO(s) + C(s) Is endothermic.Which of the following statements is true?

The standard reaction free energy for the oxidation of glucose is -2879 kJ·mol-1.What is the maximum nonexpansion work obtainable from 125 g glucose,C6H12O6(s)?

Consider the compounds PCl5(g) ,HCN(g) ,CuO(s) ,NO(g) ,NH3(g) ,and SO2(g) . Which compound will have approximately the same stability with respect to its elements if the temperature is raised?

Calculate the standard free energy of formation of mercury(II) oxide at 298 K,given

Which of the following has the lowest standard molar entropy?

The temperature of 2.00 mol Ne(g) is increased from 25 ∘\circ∘ C to 200 ∘\circ∘ C at constant pressure.Calculate the change in the entropy of neon (assume ideal behavior) .

Calculate the change in entropy of a large pail of water after 200 J of energy is reversibly transferred to the water at 20 ∘\circ∘ C.

The reaction 2C(s)+ 2H2(g) →\rightarrow→ C2H4(g)is endothermic.This reaction will not be spontaneous at any temperature.

All the following compounds become less stable with respect to their elements as the temperature is raised except

Which one of the following statements is true?

Which of the following statements is true?

When calculating the entropy of vaporization of water at 25 ∘\circ∘ C,the dominant contribution is

The enthalpy of fusion of H2O(s) at its normal melting point is 6.01 kJ.mol-1.The entropy change for freezing 1 mol of water at this temperature is

All entropies of fusion are positive.

Reactions with positive values of Δ\DeltaΔ Sro always become spontaneous at low temperatures.

Which of the following reactions has the smallest value of Δ\DeltaΔ S ∘\circ∘ ?

Which of the following has the smallest molar entropy?

Under what conditions (e.g.,constant P)are the following relations true? (a) Δ\DeltaΔ G = Δ\DeltaΔ H - T Δ\DeltaΔ S (b)q = Δ\DeltaΔ H

Calculate Δ\DeltaΔ Gr ∘\circ∘ for the decomposition of mercury(II) oxide at 298 K.

The reaction 2Cu(s) + CO₂(g) $\rightarrow$ 2CuO(s) + C(s) Is endothermic.Which of the following statements is true?

The standard reaction free energy for the oxidation of glucose is -2879 kJ·mol^-1.What is the maximum nonexpansion work obtainable from 125 g glucose,C₆H₁₂O₆(s)?

Consider the compounds PCl₅(g) ,HCN(g) ,CuO(s) ,NO(g) ,NH₃(g) ,and SO₂(g) . Which compound will have approximately the same stability with respect to its elements if the temperature is raised?

The temperature of 2.00 mol Ne(g) is increased from 25^$\circ$C to 200^$\circ$C at constant pressure.Calculate the change in the entropy of neon (assume ideal behavior) .

Calculate the change in entropy of a large pail of water after 200 J of energy is reversibly transferred to the water at 20^$\circ$C.

The reaction 2C(s)+ 2H₂(g) $\rightarrow$ C₂H₄(g)is endothermic.This reaction will not be spontaneous at any temperature.

When calculating the entropy of vaporization of water at 25^$\circ$C,the dominant contribution is

The enthalpy of fusion of H₂O(s) at its normal melting point is 6.01 kJ.mol^-1.The entropy change for freezing 1 mol of water at this temperature is

Reactions with positive values of $\Delta$ S_r^o always become spontaneous at low temperatures.

Which of the following reactions has the smallest value of $\Delta$ S^$\circ$?

Under what conditions (e.g.,constant P)are the following relations true? (a) $\Delta$ G = $\Delta$ H - T $\Delta$ S (b)q = $\Delta$ H