The bond enthalpy in no is 632 kj/mol and that of each no bond in no2 is 469 kj/mol. explain the difference in bond enthalpies between the two molecules.

1. no has a double bond while in no2 the bonds are equivalent due to resonance.
2. no has a single bond while in no2 the bonds are equivalent due to resonance.
3. double bonds always have a larger bond enthalpy than single bonds.
4. the bond type does not explain the difference.

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