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The enthalpy of hydrogenation of cyclohexene is -119.5kJ/mol. If resonance energy of benzene is -150.4kJ/mol. Enthalpy of hydrogenation of benzene is ?

Asked by anirbanbag81 13th December 2017, 10:32 AM
Answered by Expert
Answer:
Enthalpy space of space hydrogenation space of space cyclohexene space equals space minus 119 space kJ divided by mol
That space is space hydrogenation space of space one space straight C equals straight C space is space minus 119 space kJ divided by mol

therefore space calculated space enthaly space of space hydrogenation space of space benzene space equals 3 cross times left parenthesis negative 119 space right parenthesis
space space space
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals negative 357 space kJ divided by mol

Resonance space energy space of space benzene space equals space increment straight H subscript Exp space minus space increment straight H subscript cal

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space minus 150 space equals negative 357 space minus increment straight H cal

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space increment straight H subscript cal space space equals space minus 207 space kJ divided by mol

space
space Enthalpy space of space hydrogenation space of space benzene equals space minus 207 kJ divided by mol space space space space space space space space space space space space space space space space space
Answered by Expert 13th December 2017, 1:10 PM
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