Water gas,a commercial fuel,is made by the reaction of hot coke carbon with steam: When equilibrium is established at 832°C,the concentrations of CO,H2,and H2O are 4.00 × 10-2,4.00 × 10-2,and 1.00 × 10-2 mol/L,respectively.Calculate the value of ΔG° for this reaction at 832°C.

A) 55.0 kJ B) 12.7 kJ C) 16.8 kJ D) -12.7 kJ E) none of these A) 55.0 kJ B) 12.7 kJ C) 16.8 kJ D) -12.7 kJ E) none of these

Exam 18: Thermodynamics and Equilibrium

For the reaction 4Ag(s)+ O₂(g)→ 2Ag₂O(s),ΔH° = -61.14 kJ and ΔS° = -132 J/K at 25°C.Which of the following statements is true? Assume that ΔH° and ΔS° are essentially temperature independent.

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Question 1

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The standard enthalpy of vaporization of Freon-11,CFCl₃,is 25.21 kJ/mol at its normal boiling point of 17°C.What is the change of entropy for 1 mol of liquid Freon-11 when it vaporizes at its normal boiling point?

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Question 2

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Which of the following statements is true concerning the reaction below? C(s,graphite)→ C(s,diamond) Substance ΔH°_f (kJ/mol)at 298 K S° (J/(mol ∙ K))at 298 K C(s,graphite) 0 5)740 C(s,diamond) 1)897 2)377

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Question 3

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A 0.0835 M solution of a particular monoprotic weak acid,HA,has a pH of 5.00 at 298 K.What is ΔG° for the following equilibrium? HA(aq)+ H₂O(l) H₃O⁺(aq)+ A^-(aq)

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Question 4

The reaction Br₂(g)→ 2Br(g)is spontaneous only at temperatures in excess of 1600°C.We can conclude that

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Question 5

Which of the following statements is true for the following reaction? NH₄HS(s)→ NH₃(g)+ H₂S(g); ΔH° = 93 kJ

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Question 6

_____ is a thermodynamic quantity that is a measure of how dispersed the energy of a system is among the different possible ways that system can contain energy.

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Question 7

Which of the following is true for the condensation of a gaseous substance?

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Question 8

In a thermodynamic system,the sum of kinetic and potential energies of the particles making up the system is referred to as its _____.

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Question 9

Consider the following hypothetical reaction (at 316.8 K).Standard free energies,in kJ/mol,are given in parentheses. A B+C ΔG° = ? (-32.2) (207.8) (-237.0) What is the value of the equilibrium constant for the reaction at 316.8 K?

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Question 10

The reaction C(s)+ CO₂(g)→ 2CO(g)is spontaneous only at temperatures in excess of 1100 K.We can conclude that

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Question 11

A certain reaction is found to be reactant favored.Which of the following is a correct description of the reaction?

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Question 12

Assuming ΔH and ΔS are constant with respect to temperature,under what conditions will a chemical reaction be spontaneous at all temperatures?

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Question 13

For which of the following reactions is ΔS° < 0 at 25°C?

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Question 14

What is the change in entropy when 7.61 mL of liquid benzene (C₆H₆,d = 0.879 g/mL)is combusted in the presence of 22.3 L of oxygen gas,measured at 298 K and 1 atm pressure? (R = 0.0821 L · atm/(K · mol)) 2C₆H₆(l)+ 15O₂(g)→ 12CO₂(g)+ 6H₂O(l); ΔS° = -437.7 J/K at 298 K

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Question 15

A certain reaction has negative values for both ΔH and ΔS.Therefore,the reaction

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Question 16

Which of the following reactions has the largest positive value of ΔS° per mole of O₂ at 25°C?

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Question 17

For the reaction ΔG°_700K = -13.457 kJ.What is K_p for this reaction at 700.K?

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Question 18

Water gas,a commercial fuel,is made by the reaction of hot coke carbon with steam: When equilibrium is established at 832°C,the concentrations of CO,H₂,and H₂O are 4.00 × 10^-2,4.00 × 10^-2,and 1.00 × 10^-2 mol/L,respectively.Calculate the value of ΔG° for this reaction at 832°C.

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Question 19

At the normal boiling point of benzene,ΔH°_vap = 30.7 kJ/mol and ΔS°_vap = 86.9 J/(mol ∙ K).What is the normal boiling point of benzene?

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Question 20

Showing 1 - 20 of 94

Exam 18: Thermodynamics and Equilibrium

For the reaction 4Ag(s)+ O2(g)→ 2Ag2O(s),ΔH° = -61.14 kJ and ΔS° = -132 J/K at 25°C.Which of the following statements is true? Assume that ΔH° and ΔS° are essentially temperature independent.

The standard enthalpy of vaporization of Freon-11,CFCl3,is 25.21 kJ/mol at its normal boiling point of 17°C.What is the change of entropy for 1 mol of liquid Freon-11 when it vaporizes at its normal boiling point?

Which of the following statements is true concerning the reaction below? C(s,graphite)→ C(s,diamond) Substance ΔH°f (kJ/mol)at 298 K S° (J/(mol ∙ K))at 298 K C(s,graphite) 0 5)740 C(s,diamond) 1)897 2)377

A 0.0835 M solution of a particular monoprotic weak acid,HA,has a pH of 5.00 at 298 K.What is ΔG° for the following equilibrium? HA(aq)+ H2O(l) H3O+(aq)+ A-(aq)

The reaction Br2(g)→ 2Br(g)is spontaneous only at temperatures in excess of 1600°C.We can conclude that

Which of the following statements is true for the following reaction? NH4HS(s)→ NH3(g)+ H2S(g); ΔH° = 93 kJ

_____ is a thermodynamic quantity that is a measure of how dispersed the energy of a system is among the different possible ways that system can contain energy.

Which of the following is true for the condensation of a gaseous substance?

In a thermodynamic system,the sum of kinetic and potential energies of the particles making up the system is referred to as its _____.

Consider the following hypothetical reaction (at 316.8 K).Standard free energies,in kJ/mol,are given in parentheses. A B+C ΔG° = ? (-32.2) (207.8) (-237.0) What is the value of the equilibrium constant for the reaction at 316.8 K?

The reaction C(s)+ CO2(g)→ 2CO(g)is spontaneous only at temperatures in excess of 1100 K.We can conclude that

A certain reaction is found to be reactant favored.Which of the following is a correct description of the reaction?

Assuming ΔH and ΔS are constant with respect to temperature,under what conditions will a chemical reaction be spontaneous at all temperatures?

For which of the following reactions is ΔS° < 0 at 25°C?

What is the change in entropy when 7.61 mL of liquid benzene (C6H6,d = 0.879 g/mL)is combusted in the presence of 22.3 L of oxygen gas,measured at 298 K and 1 atm pressure? (R = 0.0821 L · atm/(K · mol)) 2C6H6(l)+ 15O2(g)→ 12CO2(g)+ 6H2O(l); ΔS° = -437.7 J/K at 298 K

A certain reaction has negative values for both ΔH and ΔS.Therefore,the reaction

Which of the following reactions has the largest positive value of ΔS° per mole of O2 at 25°C?

For the reaction ΔG°700K = -13.457 kJ.What is Kp for this reaction at 700.K?

Water gas,a commercial fuel,is made by the reaction of hot coke carbon with steam: When equilibrium is established at 832°C,the concentrations of CO,H2,and H2O are 4.00 × 10-2,4.00 × 10-2,and 1.00 × 10-2 mol/L,respectively.Calculate the value of ΔG° for this reaction at 832°C.

At the normal boiling point of benzene,ΔH°vap = 30.7 kJ/mol and ΔS°vap = 86.9 J/(mol ∙ K).What is the normal boiling point of benzene?

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For the reaction 4Ag(s)+ O₂(g)→ 2Ag₂O(s),ΔH° = -61.14 kJ and ΔS° = -132 J/K at 25°C.Which of the following statements is true? Assume that ΔH° and ΔS° are essentially temperature independent.

The standard enthalpy of vaporization of Freon-11,CFCl₃,is 25.21 kJ/mol at its normal boiling point of 17°C.What is the change of entropy for 1 mol of liquid Freon-11 when it vaporizes at its normal boiling point?

Which of the following statements is true concerning the reaction below? C(s,graphite)→ C(s,diamond) Substance ΔH°_f (kJ/mol)at 298 K S° (J/(mol ∙ K))at 298 K C(s,graphite) 0 5)740 C(s,diamond) 1)897 2)377

A 0.0835 M solution of a particular monoprotic weak acid,HA,has a pH of 5.00 at 298 K.What is ΔG° for the following equilibrium? HA(aq)+ H₂O(l) H₃O⁺(aq)+ A^-(aq)

The reaction Br₂(g)→ 2Br(g)is spontaneous only at temperatures in excess of 1600°C.We can conclude that

Which of the following statements is true for the following reaction? NH₄HS(s)→ NH₃(g)+ H₂S(g); ΔH° = 93 kJ

The reaction C(s)+ CO₂(g)→ 2CO(g)is spontaneous only at temperatures in excess of 1100 K.We can conclude that

What is the change in entropy when 7.61 mL of liquid benzene (C₆H₆,d = 0.879 g/mL)is combusted in the presence of 22.3 L of oxygen gas,measured at 298 K and 1 atm pressure? (R = 0.0821 L · atm/(K · mol)) 2C₆H₆(l)+ 15O₂(g)→ 12CO₂(g)+ 6H₂O(l); ΔS° = -437.7 J/K at 298 K

Which of the following reactions has the largest positive value of ΔS° per mole of O₂ at 25°C?

For the reaction ΔG°_700K = -13.457 kJ.What is K_p for this reaction at 700.K?

Water gas,a commercial fuel,is made by the reaction of hot coke carbon with steam: When equilibrium is established at 832°C,the concentrations of CO,H₂,and H₂O are 4.00 × 10^-2,4.00 × 10^-2,and 1.00 × 10^-2 mol/L,respectively.Calculate the value of ΔG° for this reaction at 832°C.

At the normal boiling point of benzene,ΔH°_vap = 30.7 kJ/mol and ΔS°_vap = 86.9 J/(mol ∙ K).What is the normal boiling point of benzene?