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Question

ΔHof of N2O is 82 kJ/mol and bond energy for N2, N=N, O=O and N=O bonds are 946,418,498 and 607 kJ/mol respectively. Resonance energy of N2O is:

A
170 kJ/mol
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B
252 kJ/mol
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C
88 kJ/mol
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D
1195 kJ/mol
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Solution

The correct option is C 88 kJ/mol
N2+12O2N2O
ΔfH=bond energy of reactantsbond energy of products
ΔfH=[946+12×498][418+607]=170kJ/mol
Resonance energy of N2O=[actual ΔfH0][observed ΔfH]
Resonance energy of N2O=82170=88kJ/mol

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