At 25°C,?G°f is -620 kJ/mol for SiCl4(g)and -592 kJ/mol for MgCl2(s).Calculate ?G° for the reaction,SiCl4(g)+ 2 MG(s) $\rarr$ 2 MgCl2(s)+ Si(s)and determine if the reaction is spontaneous at 25°C if the pressure of SiCl4(g)is 1 atm.

A) ?G° = 28 kJ;the process is spontaneous. B) ?G° = 28 kJ;the process is nonspontaneous. C) ?G° = -564 kJ;the process is spontaneous. D) ?G° = -564 kJ;the process is nonspontaneous. A) ?G° = 28 kJ;the process is spontaneous. B) ?G° = 28 kJ;the process is nonspontaneous. C) ?G° = -564 kJ;the process is spontaneous. D) ?G° = -564 kJ;the process is nonspontaneous.

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.

The figure below represents the spontaneous reaction of HS1U1B12S1U1B0 (shaded spheres)with OS1U1B12S1U1B0 (unshaded spheres)to produce gaseous HS1U1B12S1U1B0O. -How will the spontaneity of this reaction vary with temperature? This reaction is

A) nonspontaneous at all temperatures. B) nonspontaneous at high temperatures and spontaneous at low temperatures. C) spontaneous at high temperatures and nonspontaneous at low temperatures. D) spontaneous at all temperatures. A) nonspontaneous at all temperatures. B) nonspontaneous at high temperatures and spontaneous at low temperatures. C) spontaneous at high temperatures and nonspontaneous at low temperatures. D) spontaneous at all temperatures.

Exam 16: Thermodynamics: Entropy, free Energy, and Equilibrium

At 25°C,?G°_fis -620 kJ/mol for SiCl₄(g)and -592 kJ/mol for MgCl₂(s).Calculate ?G° for the reaction,SiCl₄(g)+ 2 MG(s) $\rarr$ 2 MgCl₂(s)+ Si(s)and determine if the reaction is spontaneous at 25°C if the pressure of SiCl₄(g)is 1 atm.

(Multiple Choice)

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Question 61

According to the third law of thermodynamics,

(Multiple Choice)

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Question 62

The sign (+ or -)of ΔH is and the sign (+ or -)of ΔS is for the evaporation of water.

(Short Answer)

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Question 63

A hot penny is dropped into cold water inside a polystyrene foam cup.Assuming negligible heat loss to the atmosphere and the cup,

(Multiple Choice)

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Question 64

Which of the following processes are spontaneous? I.dissolving more solute in an unsaturated solution II.dissolving more solute in a saturated solution III.dissolving more solute in a supersaturated solution

(Multiple Choice)

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Question 65

For the reaction below ΔG° = +33.0 kJ,ΔH° = +92.2 kJ,and ΔS° = +198.7 J/K.Estimate the temperature at which this reaction becomes spontaneous. 2 NH₃(g)→ N₂(g)+ 3 H₂(g)

(Multiple Choice)

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Question 66

An electron in an oxygen p orbital on which of the following would have the highest entropy?

(Multiple Choice)

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Question 67

-According to the diagram above,

(Multiple Choice)

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Question 68

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 69

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 70

Why is the sign of ΔG rather than the sign of ΔS_total generally used to determine the spontaneity of a chemical reaction?

(Multiple Choice)

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Question 71

A reaction has ΔH° = 61.9 kJ/mol and ΔS° = 405.4 J/K.Is this reaction spontaneous or nonspontaneous? At what temperature (if any)can the spontaneity be reversed?

(Multiple Choice)

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Question 72

For the following reaction find K_p at 25°C and indicate whether K_p should increase or decrease as the temperature rises. NH₄HS(s)⇌ H₂S(g)+ NH₃(g)ΔH° = 83.47 kJ and ΔG° = 17.5 kJ at 25°C.

(Multiple Choice)

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Question 73

At 25°C,ΔH° = 1.895 kJ and ΔS° = -3.363 J/K for the transition C(graphite)→ C(diamond) Based on these data,

(Multiple Choice)

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Question 74

Which is the lowest at 25°C?

(Multiple Choice)

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Question 75

-The figure above represents the reaction O₂(g)→ 2O(g),which is nonspontaneous at 25°C.How will the spontaneity of this reaction vary with temperature? This reaction is

(Multiple Choice)

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Question 76

A reaction for which ΔH° = + 98.8 kJ and ΔS° = + 141.5 J/K is (spontaneous or nonspontaneous)at low temperatures and (spontaneous or nonspontaneous)at high temperatures.

(Short Answer)

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Question 77

Which of the following is a criterion for spontaneity that holds for any process?

(Multiple Choice)

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Question 78

Which of the three laws of thermodynamics provides a criterion for spontaneity?

(Multiple Choice)

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Question 79

The figure below represents the spontaneous reaction of H₂ (shaded spheres)with O₂ (unshaded spheres)to produce gaseous H₂O. -How will the spontaneity of this reaction vary with temperature? This reaction is

(Multiple Choice)

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Question 80

Showing 61 - 80 of 144

Exam 16: Thermodynamics: Entropy, free Energy, and Equilibrium

At 25°C,?G°f is -620 kJ/mol for SiCl4(g)and -592 kJ/mol for MgCl2(s).Calculate ?G° for the reaction,SiCl4(g)+ 2 MG(s) →\rarr→ 2 MgCl2(s)+ Si(s)and determine if the reaction is spontaneous at 25°C if the pressure of SiCl4(g)is 1 atm.

According to the third law of thermodynamics,

The sign (+ or -)of ΔH is ________ and the sign (+ or -)of ΔS is ________ for the evaporation of water.

A hot penny is dropped into cold water inside a polystyrene foam cup.Assuming negligible heat loss to the atmosphere and the cup,

Which of the following processes are spontaneous? I.dissolving more solute in an unsaturated solution II.dissolving more solute in a saturated solution III.dissolving more solute in a supersaturated solution

For the reaction below ΔG° = +33.0 kJ,ΔH° = +92.2 kJ,and ΔS° = +198.7 J/K.Estimate the temperature at which this reaction becomes spontaneous. 2 NH3(g)→ N2(g)+ 3 H2(g)

An electron in an oxygen p orbital on which of the following would have the highest entropy?

-According to the diagram above,

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.

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

Why is the sign of ΔG rather than the sign of ΔStotal generally used to determine the spontaneity of a chemical reaction?

A reaction has ΔH° = 61.9 kJ/mol and ΔS° = 405.4 J/K.Is this reaction spontaneous or nonspontaneous? At what temperature (if any)can the spontaneity be reversed?

For the following reaction find Kp at 25°C and indicate whether Kp should increase or decrease as the temperature rises. NH4HS(s)⇌ H2S(g)+ NH3(g)ΔH° = 83.47 kJ and ΔG° = 17.5 kJ at 25°C.

At 25°C,ΔH° = 1.895 kJ and ΔS° = -3.363 J/K for the transition C(graphite)→ C(diamond) Based on these data,

Which is the lowest at 25°C?

-The figure above represents the reaction O2(g)→ 2O(g),which is nonspontaneous at 25°C.How will the spontaneity of this reaction vary with temperature? This reaction is

A reaction for which ΔH° = + 98.8 kJ and ΔS° = + 141.5 J/K is ________ (spontaneous or nonspontaneous)at low temperatures and ________ (spontaneous or nonspontaneous)at high temperatures.

Which of the following is a criterion for spontaneity that holds for any process?

Which of the three laws of thermodynamics provides a criterion for spontaneity?

The figure below represents the spontaneous reaction of H2 (shaded spheres)with O2 (unshaded spheres)to produce gaseous H2O. -How will the spontaneity of this reaction vary with temperature? This reaction is

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At 25°C,?G°_fis -620 kJ/mol for SiCl₄(g)and -592 kJ/mol for MgCl₂(s).Calculate ?G° for the reaction,SiCl₄(g)+ 2 MG(s) $\rarr$ 2 MgCl₂(s)+ Si(s)and determine if the reaction is spontaneous at 25°C if the pressure of SiCl₄(g)is 1 atm.

The sign (+ or -)of ΔH is and the sign (+ or -)of ΔS is for the evaporation of water.

For the reaction below ΔG° = +33.0 kJ,ΔH° = +92.2 kJ,and ΔS° = +198.7 J/K.Estimate the temperature at which this reaction becomes spontaneous. 2 NH₃(g)→ N₂(g)+ 3 H₂(g)

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.

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

Why is the sign of ΔG rather than the sign of ΔS_total generally used to determine the spontaneity of a chemical reaction?

For the following reaction find K_p at 25°C and indicate whether K_p should increase or decrease as the temperature rises. NH₄HS(s)⇌ H₂S(g)+ NH₃(g)ΔH° = 83.47 kJ and ΔG° = 17.5 kJ at 25°C.

-The figure above represents the reaction O₂(g)→ 2O(g),which is nonspontaneous at 25°C.How will the spontaneity of this reaction vary with temperature? This reaction is

A reaction for which ΔH° = + 98.8 kJ and ΔS° = + 141.5 J/K is (spontaneous or nonspontaneous)at low temperatures and (spontaneous or nonspontaneous)at high temperatures.

The figure below represents the spontaneous reaction of H₂ (shaded spheres)with O₂ (unshaded spheres)to produce gaseous H₂O. -How will the spontaneity of this reaction vary with temperature? This reaction is