The standard molar enthalpies of formation of cyclohexane(l) and benzene(l) at 298 K are -156 and +49 kJ/mol, respectively. The standard enthalpy of hydrogenation of cyclohexene(l) at 298 K is -119 kJ

Question

The standard molar enthalpies of formation of cyclohexane(l) and benzene(l) at 298 K are -156 and +49 kJ/mol, respectively. The standard enthalpy of hydrogenation of cyclohexene(l) at 298 K is -119 kJ/mol. Use these data to estimate the magnitude of the resonance energy of benzene.

Prashant Kotian · Accepted Answer

Correct answer: A. Actual hydrogenation of benzene: δ H = -156 - 49 = -205 kJ/mol. Theoretical (3 isolated C=C) = 3*(-119) = -357 kJ/mol. Resonance energy =

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