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Question

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.

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Solution

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


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