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In a bond enthalpy problem, when you determine which bonds are being broken and which ones are being formed, how do you calculate the delta H of the reaction? Is it the sum of delta H products minus the sum of delta H reactants or do you simply add the sum of the bonds broken and the sum of the bonds formed?
To calculate enthalpy change of a reaction using bond enthalpies, you can add up either the bond enthalpies of the bonds broken and bonds made OR the bond enthalpies of the reactants and the products. It equates to the same enthalpy change.
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