Question

Heat of atomisation of NH3 and n2h4 are x and you calculate bond energy of n-n bond

Answer 1

4NH3--> 12(N-H)

3N2H4--> 3(N-N) + 12(N-H) = 3(N-N) + 4x

3y = 3(N-N) + 4x

N-N Bond enthalpy = (3y-4x)/3