The rate constants for decomposition of acetaldehyde have been measured over the temperature range 700 1000 K . The data has been analysed by plotting $\ln \mathrm{k}$ vs $\frac{10^3}{\mathrm{~T}}$ graph. The value of activation energy for the reaction is $\_\_\_\_$ $\mathrm{kJ} \mathrm{mol}^{-1}$. (Nearest integer) (Given: $\mathrm{R}=8.31 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ )