Calculate the resonance energy of N 2 O from the following data; Δ f H of N 2 O is 82 KJ m o l - 1 N ≡ N , 946 KJ m o l - 1 , N = N , 418 KJ m o l - 1 , 0 = 0, 498 KJ m o l - 1 , N = 0,607 KJ m o l - 1 .

Question

Calculate the resonance energy of N 2 O from the following data; Δ f H of N 2 O is 82 KJ m o l - 1 N ≡ N , 946 KJ m o l - 1 , N = N , 418 KJ m o l - 1 , 0 = 0, 498 KJ m o l - 1 , N = 0,607 KJ m o l - 1 ., + 8.85 kJ mol − 1, − 88 kJ mol − 1, − 8.8 kJ mol − 1, + 88 kJ mol − 1

MARKS App · Accepted Answer

Reaction N 2 + 1 2 O 2 → N 2 O; ΔH = 82 kJ mol − 1 The structure of N 2 O is N = N = O Δ f H (calculated) = Bond energy of reactant – Bond energy of product = ( N ≡ N ) + 1 2 ( O = O ) - [ ( N = N ) + ( N = O ) ] = 946 + 1 2 498 − 418 + 607 = 170 kJ Resonance energy = experimental Δ f H N 2 O − calculated Δ f H N 2 O = 82 − 170 = − 88 kJ mol − 1 .

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