The enthalpy of hydrogenation of cyclohexene is 119.5
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The enthalpy of hydrogenation of cyclohexene is -119.5 kj/mol. What is the enthalpy of benzene, if its resonance energy is -150.4 kJ/mol?
Answered by admin @
Enthalpy of hydrogentaion of cyclohexene = -119.5 kJ/mol
∴ calculated enthalpy of hydrogenation of benzene=3(-119.5) = -358.5 kJ/mol, 《since benzene has 3 pi bonds and cyclohexene has 1 pi bond.》
Actual enthalpy of hydrogenation = -358.5 kJ/mol - (-150.4 kJ/mol) = -208.1 kJ/mol
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