Bond enthalpy.

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Bond energy or enthalpy of a given bond is defined as the average of energies required to dissociate one mole of said bond present in different gaseous compounds into free atoms or radicals in the gaseous state. The word 'average' in the definition of bond energy is used because the bond energy of a particular bond is not the same when present in different compounds. Therefore, an average value is taken. For example, the O—H bond energy in water molecule is the average of the two bond dissociation energies.

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