Question

The bond dissociation energies of X₂, Y₂ and XY are in the ratio of 1:0.5:1. ΔH for the formation of XY is - 200KJ mol^-1.the bond dissociation energy of X₂ will be

(1) 200KJ mol^-1

(2) 100KJ mol^-1

(3) 800KJ mol^-1

(4) 400KJ mol^-1

Answer 1

(3) let B.E. of x₂, y₂ & xy are x kJ mol^–1, 0.5x kJ mol^–1 and x kJ mol^–1 respectively