Enthalpies of formation of ethane, ethyene and benzene from the gaseous atoms are $-2839.2$, $-2275.2$ and $-5536 \mathrm{kJ} {\mathrm{mol}}^{-1}$, respectively. Bond enthalpy of C-H is $410.87 \mathrm{kJ} {\mathrm{mol}}^{-1}$. Resonance energy of benzene is