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Question
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?
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?
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Solution
The correct option is D −208.1 kJ/mol
Enthalpy of hydrogentaion of cyclohexene = −119.5 kJ/mol
∴ calculated enthalpy of hydrogenation of benzene is: 3(−119.5) = −358.5 kJ/mol
Since the actual value should be lower by an amount equal to resonance energy, actual enthalpy of hydrogenation is
= −358.5 kJ/mol − (−150.4 kJ/mol)
= −208.1 kJ/mol
Enthalpy of hydrogentaion of cyclohexene = −119.5 kJ/mol
∴ calculated enthalpy of hydrogenation of benzene is: 3(−119.5) = −358.5 kJ/mol
Since the actual value should be lower by an amount equal to resonance energy, actual enthalpy of hydrogenation is
= −358.5 kJ/mol − (−150.4 kJ/mol)
= −208.1 kJ/mol
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