What is the minium kelvin temperature the system must be heated to to make the below reaction product favored?

Question

Zn (s) + Al2O3 (s) → ZnO (s) + Al (s)
b)What is the change in entropy (J/K-mol) for the universe of the above reaction at 25 oC ?

c)For the same reaction, what is the maximum useful work (kJ) that can be performed on the surroundings from the production of 9.0 moles of ZnO (s) ?

Answer 1

G=H-TS

a)G=0=H-TS so the minimum T=H/S in Kelvin.
b)Find the enthalpy and entropy and plug into the above equation. (temperature in Kelvin).