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= 90. kJ , Srxn= 152 J/K , T= 303 K

Express your answer using two significant figures.

Part B

Hrxn= 90. kJ , Srxn= 152 J/K , T= 750 K

Express your answer using two significant figures.

Part C

Hrxn= 90. kJ , Srxn= 152 J/K , T= 303 K

Express your answer using two significant figures.

Part D

Hrxn= 90. kJ , Srxn= 152 J/K , T= 407 K

Express your answer using two significant figures.

Part E

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

Part F

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

Part G

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

Part H

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

Explanation / Answer

According to chegg rules we have to answer only first four questions.

Part A

Hrxn= 90. kJ , Srxn= 152 J/K , T= 303 K

Part A

G = H-TS

Hrxn= 90. kJ , Srxn= 152 J/K , T= 303 K

So G = = 90 X 1000 J - 303 X 152

= 43944 J

= 43.94 KJ

Part B

Hrxn= 90. kJ , Srxn= 152 J/K , T= 750 K

G = H-TS

Hrxn= 90. kJ , Srxn= 152 J/K , T= 750 K

G = 90 X 1000 - 750 X 152

= -24000 Joules

= -24.00 KJ

Part C

Hrxn= 90. kJ , Srxn= 152 J/K , T= 303 K

G = H-TS

Hrxn= 90. kJ , Srxn= 152 J/K , T= 303 K

G = 90 X1000 - 303 (-152)

= 136056 J

= 136.06 KJ

Part D

Hrxn= 90. kJ , Srxn= 152 J/K , T= 407 K

G = H-TS

Hrxn= 90. kJ , Srxn= 152 J/K , T= 407 K

G = -90 X 1000 - 407 (152)

= -151864 J

= -151.86 KJ

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