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Question

Calculate the resonance energy of N2O from the following data:
ΔHf of N2O=82kJmole1
Bond energies of NN, N=N, O=O and N=O bonds are 946, 418, 498 and 607 kJ mole1 respectively.

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Solution

N2+12O2N2O (N=N=O)

ΔHW.O.R=(B.ENN+12B.EO=O)(B.EN=N+B.EN=O)

ΔHW.O.R=(946+12×498)(418+607)=11951025=170 kJ/mole

also

ΔHW.R=ΔHW.O.RR.EReactant+R.Eproduct

82=1700+R.Eproduct

R.Eproduct=82170=88kJ

R.EN2O=82170=88kJ

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