Calculate the change in Gibbs free energy for each of the following sets of H rx

Question

Calculate the change in Gibbs free energy for each of the following sets of Hrxn, Srxn, and T.

Part A

Hrxn= 84 kJ , Srxn= 140 J/K , T= 310 K

Express your answer using two significant figures.

38.171

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Part B

Hrxn= 84 kJ , Srxn= 140 J/K , T= 754 K

Express your answer using two significant figures.

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Part C

Hrxn= 84 kJ , Srxn= 140 J/K , T= 310 K

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Part D

Hrxn= 84 kJ , Srxn= 140 J/K , T= 396 K

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Part E

Predict whether or not the reaction in part A will be spontaneous at the temperature indicated.

Predict whether or not the reaction in part A will be spontaneous at the temperature indicated.

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Part F

Predict whether or not the reaction in part B will be spontaneous at the temperature indicated.

Predict whether or not the reaction in part B will be spontaneous at the temperature indicated.

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Part G

Predict whether or not the reaction in part C will be spontaneous at the temperature indicated.

Predict whether or not the reaction in part C will be spontaneous at the temperature indicated.

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Part H

Predict whether or not the reaction in part D will be spontaneous at the temperature indicated.

Predict whether or not the reaction in part D will be spontaneous at the temperature indicated.

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Explanation / Answer

A)

G = H- TS

G = 84000-310*140 = 40600 J = 40.6 kJ

b)

G= H - TS

G = 84000-757*140 = -21980 J

G = -21.98 kJ

c)

G= H - TS

G = 84000-310*(-140)

G = 127400 J

G = 127.400 kJ

d)

G= H - TS

G = -84000-396*140

G= -139440 J

G = -139.44 kJ

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