Calculate the enthalpy of combustion of benzene ( λ ) on th…

Chemistry Thermodynamics and Thermochemistry Heat of Reaction Subjective Type

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Calculate the enthalpy of combustion of benzene ( λ ) on the bases of the following data –

(i) Resonance energy of benzene ( λ ) = –152 KJ/mol

(ii) Enthalpy of hydrogenation of cyclohexene ( λ ) = – 119 KJ/mol

(iii) Δ H° f C 6 H 12 ( λ ) = –156 KJ/mol, Δ H ° f of
H 2 O( λ ) = –285.8 KJ/mol

Δ H° f CO 2 (g) = –393.5 KJ/mol is .....................KJ/mol (in possible –ve integer)

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

3267

Sol.

+ H 2 → , Δ H = –119 KJ/mol

+ 3H 2 → , Δ H = –3 × 119 KJ/mol

Δ H° f benzene = –156 + 357

theoretical = 201 KJ/mol.

but Resonance energy

= –

Δ H° f(actual) = –152 + 201 = 49 KJ/mol

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