The correct relationship between free energy change

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

  1. ΔG° = RT ln Kc
  2. -ΔG = RT ln Kc
  3. -ΔG = RT ln Kc
  4. -ΔG° = RT ln Kc

Answer

ΔG = ΔG° + 2.303 RT log Kc

At equilibrium, ΔG = 0

ΔG° = –2.303 RT log Kc

The correct option is D.