Chemistry - Thermochemistry Question with Solution | TestHub

$\therefore$ Heat of hydrogenation of cyclohaxene $=-119.5\mathrm{kJ}/\mathrm{mol}$ $\therefore$ Heat of hydrogenation of benzene $=3\times -119.5=-358.5\mathrm{kJ}/\mathrm{mol}$ Resonance energy $=$ Observed $\Delta \mathrm{H}-$ Calculated $\Delta \mathrm{H}$ $=-150.4=-358.5-x$ $x=-208.1\mathrm{kJ}$ Related Theory The energy calculated for a resonance hybrid is lower than the energies of any of the alternative structures; the molecule is then said to be stabilized by resonance.