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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?

(a) -269 kJ/mol
(b) -358.5 kJ/mol
(c) -508.9 kJ/mol
(d) -208.1 kJ/mol

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Answer: -208.1 kJ/mol
Enthalpy of hydrogentaion of cyclohexene = -119.5 kJ/mol
$\therefore$ 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
answered Feb 28, 2014 by mosymeow_1

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