Explain with the help of an example, the difference between bond dissociation energy and bond energy.

Explanation

Bond dissociation energy is the energy required to break 1 mole of bonds. E.g.
`H - H(g) rarr 2H(g) " "Delta H = 436 kJ mol^(-1)`
Bond energy is the energy released when 1 mole of bonds are formed. Example
`2H rarr H_(2)(g) " "Delta H = -436 kJ mol^(-1)`
In diatomic molecules both bond dissociation energy and bond energy are equal in magnitude but opposite in sign.