Calculate ΔG° (in kJ/mol) for each of the following reactions from the equilibrium constant at the temperature given.

a) ΔG° = -RT ln(K)
b) ΔG° = RT ln(K)
c) ΔG° = (ΔH° - TΔS°)/T
d) ΔG° = ΔH° - TΔS°