Valence Bond Theory & Hybridization
Resonance Energy Calculation
Resonance in X
2Y can be represented as

The enthalpy of formation of

is 80 kJ mol
–1. The magnitude of resonance energy of X
2Y is ________ kJ mol
–1 (nearest integer value)
Given : Bond energies of X ≡ X, X = X, Y = Y and X = Y are 940, 410, 500 and 602 kJ mol
–1 respectively.
valence X : 3, Y : 2