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Question: Resonance energy of benzene is – 142 kJ/mol Given: Heat of atomization of graphite = 716 kJ/mol. Bon...

Resonance energy of benzene is – 142 kJ/mol Given: Heat of atomization of graphite = 716 kJ/mol. Bond energy of C–H, C–C, C=C and H–H bonds are 490, 340, 620, 436 kJ/mol respectively. DH0f ofC6H6 is -

A

– 358 kJ/mol

B

– 216 kJ/mol

C

– 74 kJ/mol

D

– 500 kJ/mol

Answer

– 358 kJ/mol

Explanation

Solution

6 C(s) + 3H2 (g) ¾® C6H6(g)

= 6(716) + 3 (436) – 3(340) – 3(620) – 6(490)

DH0f(Actual) = DH0f(Theoretical) – 142. = – 358 kJ/mol.