If the activation energy of a reaction is $80.9 \mathrm{kJ} {\mathrm{mol}}^{-1}$, the fraction of molecules at $700 \mathrm{K}$, having enough energy to react to form products is ${\mathrm{e}}^{-\mathrm{x}}$. The value of $\mathrm{x}$ is (Rounded off to the nearest integer) [Use $\mathrm{R}=8.31 \mathrm{J} {\mathrm{K}}^{-1} {\mathrm{mol}}^{-1}$]