The enthalpy of hydrogenation of cyclohexene is -119.5 kJ mol-1. If resonance energy of benzene is -150.4 kJ mol-1, calculate its enthalpy of hydrogenation in kJ.

The resonance energy provides extra stability to the benzene molecules so it has to be overcome, for hydrogenation to take place, so  ΔF=−358.5−(−150.4)=−208.1  kJ