Question

The heat of atomisation of ph3 (g) and bh4(g) are 954 kj mol and 1488 kj mol respectively. The p- p bond energy in kj mol-1 is

Answer 1

Explanation:

To calculate an energy change for a reaction:

add together the bond energies for all the bonds in the reactants - this is the 'energy in'

add together the bond energies for all the bonds in the products - this is the 'energy out'

energy change = energy in - energy out.