To calculate the resonance energy of benzene by comparing the enthalpy of hydrogenation with that of cyclohexene molecule.
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Enthalpy of hydrogentaion of cyclohexene = -119.5 kJ/mol
∴∴ calculated enthalpy of hydrogenation of benzene=3(-119.5) = -358.5 kJ/mol
Since actual value is lower by an amount equal to resonance energy hance, actual enthalpy of hydrogenation = -358.5 kJ/mol - (-150.4 kJ/mol) = -208.1 kJ/mol
∴∴ calculated enthalpy of hydrogenation of benzene=3(-119.5) = -358.5 kJ/mol
Since actual value is lower by an amount equal to resonance energy hance, actual enthalpy of hydrogenation = -358.5 kJ/mol - (-150.4 kJ/mol) = -208.1 kJ/mol
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