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MO Theory and Dissociation Energy

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Use simple MO Theory (LCAO-MO) to explain why the dissociation energy of neutral N2 is greater than the N2+ ion, but that the dissociation energy of the O2+ ion is greater than the O2 neutral.

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Solution Preview

In order to understand fully the structures of N2,N2+,O2 and O2+ we should know the electronic configurations of these species.

N2 and N2+

Molecule of N2 has 10 electrons distributed in bonding and antibonding molecular orbitals as under:

ORBITALS NUMBER OF ELECTRONS
sigma 2s(bonding) 2
sigma 2s (antibonding) 2
pi-2p (bonding) ...

Solution Summary

The solution explains the dissociation energy of neutral nitrogen and oxygen with reference to the MO theory.

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