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Bond enthalpies are for breaking bonds in gases, so you need to add in the enthalpy of phases changes for reactants/products that are liquid or solid. Additionally, they're averages from many different molecules, which makes them less accurate. Using Hess's Law or the standard enthalpies would be a better method.
Bond enthalpies of diatomic molecules are completely accurate, but for all other bonds formed the bond enthalpy given is an average of all different bonds of that nature that occurred instead of the actual value for that specific bond or reaction, so there is some error, making it the least accurate.
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