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

Question

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

a. Hrxn= 81 kJ , Srxn= 148 J/K , T= 301 K Express your answer using two significant figures.Predict whether or not the reaction in part A will be spontaneous at the temperature indicated.

b. Hrxn= 81 kJ , Srxn= 148 J/K , T= 759 K Express your answer using two significant figures.Predict whether or not the reaction in part B will be spontaneous at the temperature indicated.

c. Hrxn= 81 kJ , Srxn= 148 J/K , T= 301 K Predict whether or not the reaction in part C will be spontaneous at the temperature indicated.

d. Hrxn= 81 kJ , Srxn= 148 J/K , T= 408 K Predict whether or not the reaction in part D will be spontaneous at the temperature indicated.

Explanation / Answer

G= H - S*T

1) G= 81000-(148*301)

=>G= 36.452 KJ

Since G is positive, then the reaction is non-spontaneous.

2) G= 81000-(148* 759)

=>G= -31.33 KJ

Since G is negative, then the reaction is spontaneous.

3) G= 81000 - ( 148*301)

=>G= 125.54 KJ

Since G is positive, then the reaction is non-spontaneous.

4) G= 81000 -( 148*408)

=>G= -141.38 KJ

Since G is negative, then the reaction is spontaneous.

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