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  4. Heat of dissociation of benzene to elements is 5535 kJ mol -1. The bond enthalpies of C - C , C = C and C - H are 347.3 615.0 and 416.2 kJ respectively. Resonance energy of benzene is

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Q. Heat of dissociation of benzene to elements is $5535\, kJ\, mol ^{-1}$. The bond enthalpies of $C - C , C = C$ and $C - H$ are $347.3\, 615.0$ and $416.2\, kJ$ respectively. Resonance energy of benzene is

Thermodynamics

Solution:

Calculated value of heat of dissociation

$=3( C - C )+3( C = C )+6( C - H )$

$=3 \times 347.3+3 \times 615.0+6 \times 416.2$

$=1041.9+1845+2497.2=5384.1 \,kJ$

Resonance energy = experimental value- calculated value

$=5535.0-5384.1=150.9 \approx 151 \,kJ$

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