The rate constant of a reaction increases by five times on increase in temperature from 27^° C to 52^° C. The value of activation energy in kJ mol^-1…

The rate constant of a reaction increases by five times on increase in temperature from $\displaystyle 27^{\circ} \mathrm{C}$ to $\displaystyle 52^{\circ} \mathrm{C}$. The value of activation energy in $\displaystyle \mathrm{kJ} \mathrm{mol}^{-1}$ is \_\_\_\_. (Rounded-off to the nearest integer) $$\left[\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right] $$