For the same type of bond, bond enthalpies differ from compound to compound. For instance, the C-H bond enthalpy in methane is nearly identical to that of ethane, butane, etc. As a result, the accuracy of the average figure we discover when looking up the bond enthalpy for a C-H bond in a table of bond enthalpies may only be 2 or 3.
Each compound's enthalpies of production are listed, and those numbers take into account any minor variations in the enthalpies of each bond. Therefore, the conclusion will be more accurate if we utilize enthalpies of formation rather than average bond enthalpies to determine the enthalpy change of a given reaction.
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