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. Hrxn= 81 kJ , Srxn= 153 J/K , T= 290 K Predict whether or not the reaction in part A will be spontaneous at the temperature indicated. Hrxn= 81 kJ , Srxn= 153 J/K , T= 756 K Predict whether or not the reaction in part B will be spontaneous at the temperature indicated. Hrxn= 81 kJ , Srxn= 153 J/K , T= 290 K Predict whether or not the reaction in part C will be spontaneous at the temperature indicated. Hrxn= 81 kJ , Srxn= 153 J/K , T= 392 K Predict whether or not the reaction in part D will be spontaneous at the temperature indicated.

Explanation / Answer

G = H - TS

If G is negataive then the reaction is spontaneous.

A) G = H - TS

          = 81 - (290*0.153) => 36.63 KJ. Reaction is non-spontaneous

B) G = H - TS

          = 81 - (756*0.153) => -34.67 KJ, Reaction is spontaneous.

C) G = H - TS

          = 81 - (290*-0.153) => 125.37 KJ , Reaction is non-spontaneous.

D) G = H - TS

          = -81 - (392*0.153) => -140.98 KJ, Reaction is spontaneous.

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.