Question

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_c is

(a) ΔG = RT ln K_c 

(b) –ΔG = RT ln K_c

(c) ΔG ° = RT ln K_c 

(d) –ΔG ° = RT ln K_c .

Answer 1

(d) :  ΔG =  ΔG° + 2.303 RTlogK_c
At equilibrium,  ΔG = 0
 ΔG° = –2.303 RTlogK_c