For a reversible reaction A ⇌ B, the Δ H_forward reaction =20 kJ mol^-1. The activation energy of the uncatalysed forward reaction is 300 kJ mol^-1.…

For a reversible reaction $\displaystyle \mathrm{A} \rightleftharpoons \mathrm{B}$, the $\displaystyle \Delta \mathrm{H}_{\text {forward reaction }}=20 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The activation energy of the uncatalysed forward reaction is $\displaystyle 300 \mathrm{~kJ} \mathrm{~mol}^{-1}$. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at $\displaystyle 27^{\circ} \mathrm{C}$ is found to be same as that of the uncatalysed reaction at $\displaystyle 327$°C. The activation energy of the catalysed backward reaction is $\displaystyle \_\_\_\_$ $\displaystyle \mathrm{kJ} \mathrm{mol}^{-1}$.