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Q.

The bond dissociation energies of NN, N=N, O=O&N=O are 946, 418, 498 and 607 KJ/mole respectively.  If heat of formation of N2O is 82 KJ/mole then the magnitude of  resonance energy of N2O in KJ/mole is__

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a

92 KJ/mole

b

88 KJ/mole

c

83 KJ/mole

d

78.5 KJ/mole

answer is C.

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Detailed Solution

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NN+12(O=O)N=N=O;ΔHf(cal)=?

ΔH=  [BDE(R)BDE(P)]

ΔHf(cal)=(946+4982)(418+607)

ΔHf(cal)=170KJ/mole

ΔHf(Expt)=82KJ/mole

Resonance Energy =ΔHf(cal)ΔHf(Expt)

RE=17082

RE=88KJ/mole

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