Calculate the resonance energy of N2O from the following data: ΔHof of N2O=134KJmol−1 Bond energy of N−O,N=O,N≡N and O=O bonds are 222,607,946 and 498kJmol−1 respectively.
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Solution
N≡N(g)+12(O=O)→N=N=O(g) ΔHf(N2O)=[ΔH(N≡N)+12ΔH(O=O)]−[ΔH(N=O)+ΔH(N=N)] =(946+12×498)−(607+418) =1195−1025=170kJmol−1 Resonance energy = Observed heat of formation ∼ Calculated heat of formation =82∼170=88kJmol−1