Question 1

The following reaction is spontaneous under standard state conditions at 25°C:
AgCl(s)$\rarr$ Ag+(aq)+ Cl-(aq)($\Delta$G° = 55 kJ/mol)

Accepted Answer

A) True 
 B)False

Question 2

Predict the signs (-, +, or 0)of $\Delta$H and $\Delta$S, in that order, for the process: H2O(l)$\rarr$H2O(s).

Accepted Answer

The question seems to be asking for the ...

Question 3

Calculate Kp at 298 K for the reaction SO2(g) + NO2(g)  p at 298 K for the reaction SO2(g) + NO2(g)      SO3(g) + NO(g) .   A) 6.99 × 10-7 B) 5.71 × 10-8 C) 14.2 D) 475 E) 1.42 × 106" class="answers-bank-image d-inline" rel="preload" >   SO3(g) + NO(g) . p at 298 K for the reaction SO2(g) + NO2(g)      SO3(g) + NO(g) .   A) 6.99 × 10-7 B) 5.71 × 10-8 C) 14.2 D) 475 E) 1.42 × 106" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  6.99 × 10-7
B)  5.71 × 10-8
C)  14.2
D)  475
E)  1.42 × 106

Question 4

Under what conditions (always, never, high temperature only, low temperature only)is the expansion of an ideal gas into a vacuum expected to be spontaneous?

Accepted Answer

The answer of Under what conditions (always, never, high temperature...

Question 5

Nitrosyl chloride (NOCl) decomposes at elevated temperatures according to the equation 2NOCl(g)    2NO(g) + Cl2(g) .Calculate Kp for this reaction at 227°C.( \Delta H° = 81.2 kJ/mol,  \Delta S° = 128 J/K·mol)  A) 1.59 × 10-2 B) 2.10 × 10-7 C) 62.8 D) 4.90 × 106 E) 3.20 × 109 " class="answers-bank-image d-inline" rel="preload" >  
2NO(g) + Cl2(g) .Calculate Kp for this reaction at 227°C.( Δ\DeltaΔ H° = 81.2 kJ/mol,  Δ\DeltaΔ S° = 128 J/K·mol)

Accepted Answer

A)  1.59 × 10-2
B)  2.10 × 10-7
C)  62.8
D)  4.90 × 106
E)  3.20 × 109

Question 6

Kw for the auto-ionization of water, H2O(l)  →\rarr→  H+(aq) + OH- (aq) , is 1.0 × 10-14.What are the signs (+/-) of  Δ\DeltaΔ S° and  Δ\DeltaΔ H° for the reaction at 25°C?

Accepted Answer

A)  ( Δ\DeltaΔ S° = (+) and  Δ\DeltaΔ H° = (+) ) 
B)  ( Δ\DeltaΔ S° = (+) and  Δ\DeltaΔ H° = (-) ) 
C)  ( Δ\DeltaΔ S° = (-) and  Δ\DeltaΔ H° = (+) ) 
D)  ( Δ\DeltaΔ S° = (-) and  Δ\DeltaΔ H° = (-) )

Question 7

Predict the signs (-, +, or 0)of $\Delta$H and $\Delta$S, in that order, for the reaction: O2(g)$\rarr$ 2O(g).

Accepted Answer

The input question seems to be asking fo...

Question 8

Which of the following is consistent with a nonspontaneous process in the forward direction?

Accepted Answer

A)  ( Δ\DeltaΔ Suniv > 0,  Δ\DeltaΔ G Δ\DeltaΔ Suniv > 0) 
B)  ( Δ\DeltaΔ Suniv Δ\DeltaΔ G > 0, T Δ\DeltaΔ Suniv 
C)  ( Δ\DeltaΔ Suniv > 0,  Δ\DeltaΔ G Δ\DeltaΔ Suniv 
D)  ( Δ\DeltaΔ Suniv Δ\DeltaΔ G Δ\DeltaΔ Suniv 
E)  ( Δ\DeltaΔ Suniv > 0,  Δ\DeltaΔ G > 0, T Δ\DeltaΔ Suniv > 0)

Question 9

Using the thermodynamic data provided below, calculate Ka2 for H2CO3(aq)at 25°.

Accepted Answer

4.59 × 10^-11 (which agr...

Question 10

Which of the following is consistent with an exothermic reaction that is nonspontaneous at high temperatures?

Accepted Answer

A)  ( Δ\DeltaΔ H > 0,  Δ\DeltaΔ S Δ\DeltaΔ G 
B)  ( Δ\DeltaΔ H > 0,  Δ\DeltaΔ S > 0,  Δ\DeltaΔ G 
C)  ( Δ\DeltaΔ H Δ\DeltaΔ S > 0,  Δ\DeltaΔ G 
D)  ( Δ\DeltaΔ H Δ\DeltaΔ S > 0,  Δ\DeltaΔ G > 0) 
E)  ( Δ\DeltaΔ H Δ\DeltaΔ S Δ\DeltaΔ G > 0)

Question 11

Predict the signs (-, +, or 0)of $\Delta$H and $\Delta$S, in that order, for the reaction: 6CO2(g)+ 6H2O(g)$\rarr$C6H12O6(g)+ 6O2(g).

Accepted Answer

To predict the signs of the reaction quo...

Question 12

Using the thermodynamic data provided below, calculate the standard change in entropy when one mole of sodium sulfate is dissolved in water?  Will the solubility of sodium nitrate increase or decrease if the temperature of the system is increased?

Accepted Answer

-11.84 J/K·mol; solu...

Question 13

Consider the reaction CO(g)+ 2H2(g)   
CH3OH(l)at 25°C.
$\Delta$G°f (CO)= -137.3 kJ/mol
$\Delta$G°f (CH3OH)= -166.3 kJ/mol
$\Delta$H°f (CO)= -110.5 kJ/mol
$\Delta$H°f (CH3OH)= -238.7 kJ/mol
S°(CO)= 197.9 J/K·mol
S°(CH3OH)= 126.8 J/K·mol
Calculate $\Delta$G° at 25°C.

Accepted Answer

Question 14

Which of the following is consistent with a reaction that proceeds spontaneously in the forward direction?

Accepted Answer

A) ( Δ\DeltaΔ G > 0, Q B) ( Δ\DeltaΔ G° = 0, Q = K) C) ( Δ\DeltaΔ G K) D) ( Δ\DeltaΔ G° > 0, Q = K) E) ( Δ\DeltaΔ G < 0, Q < K)

Question 15

Choose the substance with the higher entropy per mole at a given temperature: O2(g)at 5 atm or O2(g)at 0.5 atm.

Accepted Answer

Question 16

The following reaction is nonspontaneous at 25°C:
Cu2O(s)$\rarr$2Cu(s)+ 1/2O2(g), $\Delta$G° = 141 kJ/mol
If $\Delta$S° = 75.8 J/K·mol, what is the lowest temperature at which the reaction will be spontaneous?

Accepted Answer

Question 17

Calculate Δ\DeltaΔ G° for the combustion of ethanol vapor, C2H5OH(g) , at 750°C in oxygen to form carbon dioxide and water vapor.The following data is valid at 25°C: 2H5OH(g) , at 750°C in oxygen to form carbon dioxide and water vapor.The following data is valid at 25°C:   A) -1407 kJ/mol B) -2151 kJ/mol C) -1307 kJ/mol D) -4486 kJ/mol E) -1377 kJ/mol " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  -1407 kJ/mol
B)  -2151 kJ/mol
C)  -1307 kJ/mol
D)  -4486 kJ/mol
E)  -1377 kJ/mol

Question 18

Under which of the following conditions (always, never, high temperature only, low temperature only)is the reaction: 6CO2(g)+ 6H2O(g)$\rarr$C6H12O6(g)+ 6O2(g)expected to be spontaneous?

Accepted Answer

Question 19

Hydrogen peroxide (H2O2) decomposes according to the equation H2O2(l)  →\rarr→  H2O(l) + 1/2O2(g) .
Calculate Kp for this reaction at 25°C.( Δ\DeltaΔ H° = -98.2 kJ/mol,  Δ\DeltaΔ S° = 70.1 J/K·mol)

Accepted Answer

A)  1.3 × 10-21
B)  20.9
C)  3.46 × 1017
D)  7.5 × 1020
E)  8.6 × 104

Question 20

The normal freezing point of ammonia is -78°C.Predict the signs of  Δ\DeltaΔ H,  Δ\DeltaΔ S, and  Δ\DeltaΔ G for ammonia when it freezes at -80°C and 1 atm: NH3(l)  →\rarr→ NH3(s)  3(l)  \rarr NH3(s)    A) A B) B C) C D) D E) E " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  E

Exam 17: Entropy Free Energy and Equilibrium

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Predict the signs (-, +, or 0)of $\Delta$ H and $\Delta$ S, in that order, for the reaction: O₂(g) $\rarr$ 2O(g).

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The input question seems to be asking fo...
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Using the thermodynamic data provided below, calculate K_a2 for H₂CO₃(aq)at 25°.

Correct Answer
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4.59 × 10^-11 (which agr...
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Calculate K_p at 298 K for the reaction SO₂(g) + NO₂(g) SO₃(g) + NO(g) .

Correct Answer
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Which of the following is consistent with a nonspontaneous process in the forward direction?

Correct Answer
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Using the thermodynamic data provided below, calculate the standard change in entropy when one mole of sodium sulfate is dissolved in water? Will the solubility of sodium nitrate increase or decrease if the temperature of the system is increased?

Correct Answer
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-11.84 J/K·mol; solu...
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Predict the signs (-, +, or 0)of $\Delta$ H and $\Delta$ S, in that order, for the reaction: 6CO₂(g)+ 6H₂O(g) $\rarr$ C₆H₁₂O₆(g)+ 6O₂(g).

Correct Answer
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To predict the signs of the reaction quo...
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Predict the signs (-, +, or 0)of $\Delta$ H and $\Delta$ S, in that order, for the process: H₂O(l) $\rarr$ H₂O(s).

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The question seems to be asking for the ...
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Under what conditions (always, never, high temperature only, low temperature only)is the expansion of an ideal gas into a vacuum expected to be spontaneous?

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The following reaction is nonspontaneous at 25°C: Cu₂O(s) $\rarr$ 2Cu(s)+ ¹/₂O₂(g), $\Delta$ G° = 141 kJ/mol If $\Delta$ S° = 75.8 J/K·mol, what is the lowest temperature at which the reaction will be spontaneous?

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Which of the following is consistent with an exothermic reaction that is nonspontaneous at high temperatures?

Correct Answer
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Which of the following is consistent with a reaction that proceeds spontaneously in the forward direction?

Correct Answer
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Under which of the following conditions (always, never, high temperature only, low temperature only)is the reaction: 6CO₂(g)+ 6H₂O(g) $\rarr$ C₆H₁₂O₆(g)+ 6O₂(g)expected to be spontaneous?

Correct Answer
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Correct Answer
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K_w for the auto-ionization of water, H₂O(l) $\rarr$ H⁺(aq) + OH^- (aq) , is 1.0 × 10^-14.What are the signs (+/-) of $\Delta$ S° and $\Delta$ H° for the reaction at 25°C?

Correct Answer
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Hydrogen peroxide (H₂O₂) decomposes according to the equation H₂O₂(l) $\rarr$ H₂O(l) + ¹/₂O₂(g) . Calculate K_p for this reaction at 25°C.( $\Delta$ H° = -98.2 kJ/mol, $\Delta$ S° = 70.1 J/K·mol)

Correct Answer
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The following reaction is spontaneous under standard state conditions at 25°C: AgCl(s) $\rarr$ Ag⁺(aq)+ Cl^-(aq)( $\Delta$ G° = 55 kJ/mol)

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Correct Answer
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Choose the substance with the higher entropy per mole at a given temperature: O₂(g)at 5 atm or O₂(g)at 0.5 atm.

Correct Answer
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Correct Answer
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Exam 17: Entropy Free Energy and Equilibrium

Consider the reaction CO(g)+ 2H2(g) CH3OH(l)at 25°C. Δ\DeltaΔ G°f (CO)= -137.3 kJ/mol Δ\DeltaΔ G°f (CH3OH)= -166.3 kJ/mol Δ\DeltaΔ H°f (CO)= -110.5 kJ/mol Δ\DeltaΔ H°f (CH3OH)= -238.7 kJ/mol S°(CO)= 197.9 J/K·mol S°(CH3OH)= 126.8 J/K·mol Calculate Δ\DeltaΔ G° at 25°C.

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Predict the signs (-, +, or 0)of Δ\DeltaΔ H and Δ\DeltaΔ S, in that order, for the reaction: O2(g) →\rarr→ 2O(g).

Correct AnswerAnswered by ExamLex AIThe input question seems to be asking fo...View AnswerShow Answer

Using the thermodynamic data provided below, calculate Ka2 for H2CO3(aq)at 25°.

Correct Answerverified4.59 × 10-11 (which agr...View AnswerShow Answer

Calculate Kp at 298 K for the reaction SO2(g) + NO2(g) SO3(g) + NO(g) .

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Which of the following is consistent with a nonspontaneous process in the forward direction?

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Using the thermodynamic data provided below, calculate the standard change in entropy when one mole of sodium sulfate is dissolved in water? Will the solubility of sodium nitrate increase or decrease if the temperature of the system is increased?

Correct Answerverified-11.84 J/K·mol; solu...View AnswerShow Answer

Predict the signs (-, +, or 0)of Δ\DeltaΔ H and Δ\DeltaΔ S, in that order, for the reaction: 6CO2(g)+ 6H2O(g) →\rarr→ C6H12O6(g)+ 6O2(g).

Correct AnswerAnswered by ExamLex AITo predict the signs of the reaction quo...View AnswerShow Answer

Predict the signs (-, +, or 0)of Δ\DeltaΔ H and Δ\DeltaΔ S, in that order, for the process: H2O(l) →\rarr→ H2O(s).

Correct AnswerAnswered by ExamLex AIThe question seems to be asking for the ...View AnswerShow Answer

Under what conditions (always, never, high temperature only, low temperature only)is the expansion of an ideal gas into a vacuum expected to be spontaneous?

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The following reaction is nonspontaneous at 25°C: Cu2O(s) →\rarr→ 2Cu(s)+ 1/2O2(g), Δ\DeltaΔ G° = 141 kJ/mol If Δ\DeltaΔ S° = 75.8 J/K·mol, what is the lowest temperature at which the reaction will be spontaneous?

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Which of the following is consistent with an exothermic reaction that is nonspontaneous at high temperatures?

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Which of the following is consistent with a reaction that proceeds spontaneously in the forward direction?

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Under which of the following conditions (always, never, high temperature only, low temperature only)is the reaction: 6CO2(g)+ 6H2O(g) →\rarr→ C6H12O6(g)+ 6O2(g)expected to be spontaneous?

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Nitrosyl chloride (NOCl) decomposes at elevated temperatures according to the equation 2NOCl(g) 2NO(g) + Cl2(g) .Calculate Kp for this reaction at 227°C.( Δ\DeltaΔ H° = 81.2 kJ/mol, Δ\DeltaΔ S° = 128 J/K·mol)

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Kw for the auto-ionization of water, H2O(l) →\rarr→ H+(aq) + OH- (aq) , is 1.0 × 10-14.What are the signs (+/-) of Δ\DeltaΔ S° and Δ\DeltaΔ H° for the reaction at 25°C?

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Hydrogen peroxide (H2O2) decomposes according to the equation H2O2(l) →\rarr→ H2O(l) + 1/2O2(g) . Calculate Kp for this reaction at 25°C.( Δ\DeltaΔ H° = -98.2 kJ/mol, Δ\DeltaΔ S° = 70.1 J/K·mol)

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The following reaction is spontaneous under standard state conditions at 25°C: AgCl(s) →\rarr→ Ag+(aq)+ Cl-(aq)( Δ\DeltaΔ G° = 55 kJ/mol)

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Calculate Δ\DeltaΔ G° for the combustion of ethanol vapor, C2H5OH(g) , at 750°C in oxygen to form carbon dioxide and water vapor.The following data is valid at 25°C:

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Choose the substance with the higher entropy per mole at a given temperature: O2(g)at 5 atm or O2(g)at 0.5 atm.

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The normal freezing point of ammonia is -78°C.Predict the signs of Δ\DeltaΔ H, Δ\DeltaΔ S, and Δ\DeltaΔ G for ammonia when it freezes at -80°C and 1 atm: NH3(l) →\rarr→ NH3(s)

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Predict the signs (-, +, or 0)of $\Delta$ H and $\Delta$ S, in that order, for the reaction: O₂(g) $\rarr$ 2O(g).

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Using the thermodynamic data provided below, calculate K_a2 for H₂CO₃(aq)at 25°.

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4.59 × 10^-11 (which agr...
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Calculate K_p at 298 K for the reaction SO₂(g) + NO₂(g) SO₃(g) + NO(g) .

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-11.84 J/K·mol; solu...
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Predict the signs (-, +, or 0)of $\Delta$ H and $\Delta$ S, in that order, for the reaction: 6CO₂(g)+ 6H₂O(g) $\rarr$ C₆H₁₂O₆(g)+ 6O₂(g).

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To predict the signs of the reaction quo...
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Predict the signs (-, +, or 0)of $\Delta$ H and $\Delta$ S, in that order, for the process: H₂O(l) $\rarr$ H₂O(s).

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The question seems to be asking for the ...
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The following reaction is nonspontaneous at 25°C: Cu₂O(s) $\rarr$ 2Cu(s)+ ¹/₂O₂(g), $\Delta$ G° = 141 kJ/mol If $\Delta$ S° = 75.8 J/K·mol, what is the lowest temperature at which the reaction will be spontaneous?

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Correct Answer
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Correct Answer
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Under which of the following conditions (always, never, high temperature only, low temperature only)is the reaction: 6CO₂(g)+ 6H₂O(g) $\rarr$ C₆H₁₂O₆(g)+ 6O₂(g)expected to be spontaneous?

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Correct Answer
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K_w for the auto-ionization of water, H₂O(l) $\rarr$ H⁺(aq) + OH^- (aq) , is 1.0 × 10^-14.What are the signs (+/-) of $\Delta$ S° and $\Delta$ H° for the reaction at 25°C?

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Hydrogen peroxide (H₂O₂) decomposes according to the equation H₂O₂(l) $\rarr$ H₂O(l) + ¹/₂O₂(g) . Calculate K_p for this reaction at 25°C.( $\Delta$ H° = -98.2 kJ/mol, $\Delta$ S° = 70.1 J/K·mol)

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The following reaction is spontaneous under standard state conditions at 25°C: AgCl(s) $\rarr$ Ag⁺(aq)+ Cl^-(aq)( $\Delta$ G° = 55 kJ/mol)

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Choose the substance with the higher entropy per mole at a given temperature: O₂(g)at 5 atm or O₂(g)at 0.5 atm.

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Correct Answer
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