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

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

Calculate$\Delta$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:

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

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

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

Exam 17: Entropy Free Energy and Equilibrium

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?

(Short Answer)

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Question 101

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).

(Short Answer)

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Question 102

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

(True/False)

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Question 103

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?

(Short Answer)

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Question 104

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?

(Essay)

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Question 105

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

(Multiple Choice)

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Question 106

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)

(Multiple Choice)

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Question 107

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

(Multiple Choice)

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Question 108

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.

(Short Answer)

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Question 109

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

(Essay)

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Question 110

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

(Multiple Choice)

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Question 111

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

(Short Answer)

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Question 112

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?

(Multiple Choice)

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Question 113

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

(Short Answer)

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Question 114

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

(Multiple Choice)

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Question 115

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

(Multiple Choice)

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Question 116

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

(Short Answer)

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Question 117

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?

(Short Answer)

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Question 118

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

(Multiple Choice)

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Question 119

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

(Multiple Choice)

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Question 120

Showing 101 - 120 of 128

Exam 17: Entropy Free Energy and Equilibrium

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?

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).

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)

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?

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?

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

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)

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)

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.

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

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:

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

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?

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.

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

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

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

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?

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

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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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).

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

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?

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)

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.

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

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

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?

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

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?

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