Home
Class 12
CHEMISTRY
The standard molar enthalpies of formati...

The standard molar enthalpies of formation of cyclohexane (I) and benzene(I) at `25^(@)C` are `-156` and `+49 KJ mol^(-1)` respectivelyl. The standard enthalpy of hydrogentation of cyclohexene (I) at `25^(@)` is `-119 KJ mol^(-1)`. Use these data to estimate the magnitude of the resonance energy of benzene.

Text Solution

Verified by Experts


`-357 kJ = Delta H_(f)^(@)("cyclohexane") - Delta H_(f)^(@) (C_(6)H_(6))`
`implies Delta H_(f)^(@)(C_(6)H_(6))_("Theoretical") = -156 + 357 = 201 kJ`
`implies` Resonance energy = `Delta H_(f)^(@)("exp.") -DeltaH_(f)^(@)("Theoretical") = 49 - 201 = -152 kJ//mol`
Promotional Banner

Similar Questions

Explore conceptually related problems

The standard molar enthalpies of formation of cyclohexane (l) and benzene (l) at 25^@C are - 156 and +49 KJ mol^(-1) respectively. The standard enthalpy of hydrogenation of cyclo hexene (l) at 25^@C " is" -116 "KJ mol" ^(-1) . Use these data to estimate the magnitude of the resonance energy of benzene.

The standard molar enthalpies of formation of cyclohexane (l) and benzene (l) at 25^(@)C are -156 and +49 kJ mol^(-1) , respectively. The standard enthaly of hydrogenation of cyclohenxene (l) at 25^(@)C is -119 kJ mol^(-1) Use this data to estimate the magnitude of the resonance enegry of benzene.