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} =-R T \ln K $
$-\frac{\Delta G^{\circ}}{R T} =\ln K $
$\therefore K =e^{\frac{-\Delta G^{\circ}}{R T}}$