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Bond enthalpies of diatomic molecules are averages because the bond is identical in all cases, with only two atoms of the same element. For example, with H2 or Cl2. However, for other bond enthalpies, the other chemical species bonded to the atoms affect its energy. For example, for a C-H bond, the bond enthalpy would be slightly different for a C-H bonded to another C-H group vs a C-H bonded to an Oxygen. This is why their bond enthalpies are averages of many different molecules.
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