Question

The equilibrium constant (K) of a reaction may be written as :

• A. $K=e^{-\Delta G/RT}$
• B. $K=e^{-\Delta G^0/RT}$
• C. $K=e^{-\Delta H/RT}$
• D. $K=e^{-\Delta H^0/RT}$

Answer 1

Answer: (B)

Gibbs free energy $\left(\Delta G^{\circ }\right)$ is related with equilibrium constant $(K)$ as
$\Delta G^{\circ }=-RT\ln K$
$-\frac{\Delta G^{\circ }}{RT}=\ln K$
$\therefore K=e^{\frac{-\Delta G^{\circ }}{RT}}$