Question

In which case bond dissociation energy is equal to bond enthalpy?

Answer 1

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╚» While the bond-dissociation energy is the energy of a single chemical bond, the bond energy is the average of all the bond-dissociation energies of the bonds of the same type for a given molecule. For a homoleptic compound EXn, the E–X bond energy is (1/n) multiplied by the enthalpy change of the reaction EXn → E + nX.

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Answer 2

As discussed earlier, in the case of diatomic molecules, the bond dissociation enthalpy is equal to the bond energy. This is because bond energy is the average value of all the bond dissociation enthalpies of all bonds of the same type in a molecule.