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Calculate the enthalpy of combustion of ...

Calculate the enthalpy of combustion of benzene `(l)` on the basis of the following data:
a. Resonance energy of benzene `(l) =- 152 kJ// mol`
b. Enthalpy of hydrogenation of cyclohexene `(l) =- 119 kJ//mol`
c. `Delta_(f)H^(Theta)C_(6)H_(12)(l) =- 156 kJ mol^(-1)`
d. `Delta_(f)H^(Theta) of H_(2)O(l) =- 285.8 kJ mol^(-1)`
e. `Delta_(f)H^(Theta)of CO_(2)(g) =- 393.5 kJ mol^(-1)`

Text Solution

Verified by Experts


`DeltaH_(1)^(@)` (benzene) =-156 + 357 = 201 kJ/mol.
Resonance energy `=DeltaH_(l)^(@) - DeltaH_(l)^(@)`
`DeltaH_(l)`(benzene) = -152 + 201 = 49 kJ/mol.
Actual + `15/2 O_(2)(l) to 6CO_(2)(g) + 3H_(2)O(l)`.
`DeltaH^(@) = 6DeltaH_(l)^(@) CO_(2)(g) + 3DeltaH_(l)^(@)H_(2)O(l) - DeltaH_(l)^(@)` (benzene)
`=6(-393.5) + 3(-285.8)-49`
`=-3267.4` kJ/mol.
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