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In chemistry, bond dissociation energy (BDE) or D0, is one measure of the bond strength in a chemical bond. It is defined as the standard enthalpy change when a bond is cleaved by homolysis,[1] with reactants and products of the homolysis reaction at 0 K (absolute zero). For instance, the bond dissociation energy for one of the C-H bonds in ethane (C2H6) is defined by the process:

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