1.

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

Answer»

Solution :Bond dissociation energy is the energy required to break 1 MOLEOF 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.


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