Classify each of the following processes as spontaneous or nonspontaneous. I.H2O(l)→ H2O(g)T = 25°C,vessel open to atmosphere with 50% relative humidity II.H2O(s)→ H2O(l)T = 25°C,P = 1 atm

A) I and II are both spontaneous. B) I is spontaneous and II is nonspontaneous. C) I is nonspontaneous and II is spontaneous. D) I and II are both nonspontaneous. A) I and II are both spontaneous. B) I is spontaneous and II is nonspontaneous. C) I is nonspontaneous and II is spontaneous. D) I and II are both nonspontaneous.

Consider the following gas-phase reaction of AS1U1B12S1U1B0 (shaded spheres)and BS1U1B12S1U1B0 (unshaded spheres): AS1U1B12S1U1B0(g)+ BS1U1B12S1U1B0(g)⇌ 2 AB(g)ΔG ° = +25 kJ -Which of the above reaction mixtures has the most spontaneous forward reaction?

A) (1) B) (2) C) (3) D) (4) A) (1) B) (2) C) (3) D) (4)

What is the sign of ΔS for each of the following processes? I.The separation of gaseous molecules of UF6,into 238UF6 and 235UF6 At constant temperature and pressure. II.The dissolving of I2(s)in CCl4(l).

A) ΔS is negative for I and negative for II. B) ΔS is negative for I and positive for II. C) ΔS is positive for I and negative for II. D) ΔS is positive for I and positive for II. A) ΔS is negative for I and negative for II. B) ΔS is negative for I and positive for II. C) ΔS is positive for I and negative for II. D) ΔS is positive for I and positive for II.

A) ΔG increases and the reaction becomes more spontaneous. B) ΔG increases and the reaction becomes less spontaneous. C) ΔG decreases and the reaction becomes more spontaneous. D) ΔG decreases and the reaction becomes less spontaneous. A) ΔG increases and the reaction becomes more spontaneous. B) ΔG increases and the reaction becomes less spontaneous. C) ΔG decreases and the reaction becomes more spontaneous. D) ΔG decreases and the reaction becomes less spontaneous.

Exam 17: Thermodynamics: Entropy, free Energy, and Equilibrium

Acetylene,C₂H₂,has a standard enthalpy of formation,ΔH° = 226.7 kJ/mol,and a standard entropy change for its formation from its elements,ΔS° = 58.8 J/K∙mol.The standard free energy of formation of acetylene is ________ kJ/mol.

(Short Answer)

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Question 81

For bromine,ΔH°vap = 30.91 kJ/mol and ΔS°vap = 93.23 JK^-1mol^-1 at 25°C.What is the normal boiling point for bromine?

(Multiple Choice)

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Question 82

Classify each of the following processes as spontaneous or nonspontaneous. I.H₂O(l)→ H₂O(g)T = 25°C,vessel open to atmosphere with 50% relative humidity II.H₂O(s)→ H₂O(l)T = 25°C,P = 1 atm

(Multiple Choice)

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Question 83

At 2600 K,ΔG° = 775 kJ for the vaporization of boron carbide: B₄C(s)⇌ 4 B(g)+ C(s) Find ΔG and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B₄C(s),0.400 mol of C(s),and B(g)at a partial pressure of 1.0 × 10^-5 atm.At this temperature,R T = 21.6 kJ.

(Multiple Choice)

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Question 84

Which forward reaction is a nonspontaneous process?

(Multiple Choice)

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Question 85

For which process is the sign of ΔS negative in the system?

(Multiple Choice)

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Question 86

Standard free energies of formation,ΔG°,in kJ/mol,are given below each reactant and product in the reaction shown below.The standard free energy of reaction,ΔG°,for this reaction is ________ kJ. CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(l) -50.8 0 -394.4 -237.2

(Short Answer)

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Question 87

A 1.8 mole sample of gas at STP has a ________ entropy than 1.8 mole of gas at 273 K and 835 mm Hg.

(Short Answer)

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Question 88

What is the relationship between ΔG and the ΔG°_F for the reaction below? MgF₂(s)→ Mg²⁺(aq)+ 2 F^-(aq)

(Multiple Choice)

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Question 89

An ideal gas is expanded at constant temperature.What are the signs (+,-,or 0)of ΔH,ΔS,and ΔG for this system?

(Multiple Choice)

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Question 90

Consider the following gas-phase reaction of A₂ (shaded spheres)and B₂ (unshaded spheres): A₂(g)+ B₂(g)⇌ 2 AB(g)ΔG ° = +25 kJ -Which of the above reaction mixtures has the most spontaneous forward reaction?

(Multiple Choice)

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Question 91

For a spontaneous process

(Multiple Choice)

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Question 92

Which of the following straight chain molecules has the greatest standard molar entropy at 25°C?

(Multiple Choice)

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Question 93

For a particular process,ΔG = ΔH at a given temperature and pressure.Therefore,

(Multiple Choice)

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Question 94

Which provides the greatest increase in entropy?

(Multiple Choice)

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Question 95

What is the sign of ΔS for each of the following processes? I.The separation of gaseous molecules of UF₆,into ²³⁸UF₆ and ²³⁵UF₆ At constant temperature and pressure. II.The dissolving of I₂(s)in CCl₄(l).

(Multiple Choice)

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Question 96

Under which of the following conditions would one mole of Kr have the highest entropy,S?

(Multiple Choice)

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Question 97

Other than only PV work,what reaction conditions must be satisfied for the sign of ΔG to be used as a criterion for spontaneity?

(Multiple Choice)

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Question 98

If Q increases,

(Multiple Choice)

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Question 99

Which of the following statements is not true?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 150

Exam 17: Thermodynamics: Entropy, free Energy, and Equilibrium

Acetylene,C2H2,has a standard enthalpy of formation,ΔH° = 226.7 kJ/mol,and a standard entropy change for its formation from its elements,ΔS° = 58.8 J/K∙mol.The standard free energy of formation of acetylene is ________ kJ/mol.

For bromine,ΔH°vap = 30.91 kJ/mol and ΔS°vap = 93.23 JK-1mol-1 at 25°C.What is the normal boiling point for bromine?

Classify each of the following processes as spontaneous or nonspontaneous. I.H2O(l)→ H2O(g)T = 25°C,vessel open to atmosphere with 50% relative humidity II.H2O(s)→ H2O(l)T = 25°C,P = 1 atm

At 2600 K,ΔG° = 775 kJ for the vaporization of boron carbide: B4C(s)⇌ 4 B(g)+ C(s) Find ΔG and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B4C(s),0.400 mol of C(s),and B(g)at a partial pressure of 1.0 × 10-5 atm.At this temperature,R T = 21.6 kJ.

Which forward reaction is a nonspontaneous process?

For which process is the sign of ΔS negative in the system?

Standard free energies of formation,ΔG°,in kJ/mol,are given below each reactant and product in the reaction shown below.The standard free energy of reaction,ΔG°,for this reaction is ________ kJ. CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(l) -50.8 0 -394.4 -237.2

A 1.8 mole sample of gas at STP has a ________ entropy than 1.8 mole of gas at 273 K and 835 mm Hg.

What is the relationship between ΔG and the ΔG°F for the reaction below? MgF2(s)→ Mg2+(aq)+ 2 F-(aq)

An ideal gas is expanded at constant temperature.What are the signs (+,-,or 0)of ΔH,ΔS,and ΔG for this system?

Consider the following gas-phase reaction of A2 (shaded spheres)and B2 (unshaded spheres): A2(g)+ B2(g)⇌ 2 AB(g)ΔG ° = +25 kJ -Which of the above reaction mixtures has the most spontaneous forward reaction?

For a spontaneous process

Which of the following straight chain molecules has the greatest standard molar entropy at 25°C?

For a particular process,ΔG = ΔH at a given temperature and pressure.Therefore,

Which provides the greatest increase in entropy?

What is the sign of ΔS for each of the following processes? I.The separation of gaseous molecules of UF6,into 238UF6 and 235UF6 At constant temperature and pressure. II.The dissolving of I2(s)in CCl4(l).

Under which of the following conditions would one mole of Kr have the highest entropy,S?

Other than only PV work,what reaction conditions must be satisfied for the sign of ΔG to be used as a criterion for spontaneity?

If Q increases,

Which of the following statements is not true?

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Acetylene,C₂H₂,has a standard enthalpy of formation,ΔH° = 226.7 kJ/mol,and a standard entropy change for its formation from its elements,ΔS° = 58.8 J/K∙mol.The standard free energy of formation of acetylene is ________ kJ/mol.

For bromine,ΔH°vap = 30.91 kJ/mol and ΔS°vap = 93.23 JK^-1mol^-1 at 25°C.What is the normal boiling point for bromine?

Classify each of the following processes as spontaneous or nonspontaneous. I.H₂O(l)→ H₂O(g)T = 25°C,vessel open to atmosphere with 50% relative humidity II.H₂O(s)→ H₂O(l)T = 25°C,P = 1 atm

At 2600 K,ΔG° = 775 kJ for the vaporization of boron carbide: B₄C(s)⇌ 4 B(g)+ C(s) Find ΔG and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B₄C(s),0.400 mol of C(s),and B(g)at a partial pressure of 1.0 × 10^-5 atm.At this temperature,R T = 21.6 kJ.

Standard free energies of formation,ΔG°,in kJ/mol,are given below each reactant and product in the reaction shown below.The standard free energy of reaction,ΔG°,for this reaction is ________ kJ. CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(l) -50.8 0 -394.4 -237.2

What is the relationship between ΔG and the ΔG°_F for the reaction below? MgF₂(s)→ Mg²⁺(aq)+ 2 F^-(aq)

Consider the following gas-phase reaction of A₂ (shaded spheres)and B₂ (unshaded spheres): A₂(g)+ B₂(g)⇌ 2 AB(g)ΔG ° = +25 kJ -Which of the above reaction mixtures has the most spontaneous forward reaction?

What is the sign of ΔS for each of the following processes? I.The separation of gaseous molecules of UF₆,into ²³⁸UF₆ and ²³⁵UF₆ At constant temperature and pressure. II.The dissolving of I₂(s)in CCl₄(l).