The first case has N-N single bond has the second case has N-N double bond.
The term bond energy is referred to as the energy that is released when a bond is formed it is equal to the energy that is required to break the bond.
In the first case, the N-N bond has an energy of about 209 kJ/mol indicating that it must be a single bond. The second case has a bond energy of 418 kJ/mol indicating that it is an N-N double bond.
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