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The question is comparing using bond enthalpies and standard enthalpies of formation to find the change in enthalpy of the reaction. In this case you would expect there to be a difference in the answers because bond enthalpies are averages from many different molecules. Therefore, that method will be the least accurate and slightly different from the answer the standard enthalpies of formation will give you.
Exactly. There's a difference because one of the methods (bond enthalpies) relies on only the average bond energies/enthalpies for a certain bond. However the other method (enthalpies of formation) are specific to that molecule and tell you the exact energy which is needed to form it.
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