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For bonds that are not from diatomic molecules, (molecules with 2 atoms) it is practically impossible to get a constant value for a bond that is found in many different molecules. For example, the carbon-carbon double bond is present in tons of different molecules and has a very slightly different bond enthalpy in each one. As such, the values given for non-diatomic bonds are just averages of the values from many different molecule types. Therefore they are somewhat less accurate.
Bond enthalpies are the least accurate method because unless you are dealing with all diatomic elements, the values that you are using for delta H are averages, so these numbers will always be a little off. Therefore your final answer will also be a little off. Comparing this method to the other methods, it's less accurate.
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