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Bond enthalpy change.

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The total bond enthalpy of the reactants minus the total bond enthalpy of the products.

It's the only thing in energetics that does reactants-products :P

Sidenote: the actual bond enthalpies don't change (C-H bond's enthalpy won't change for example, check your data booklet for the value :)). This is finding the enthalpy change of the reaction based off bond enthalpies.

Since breaking bonds is endothermic (meaning it requires energy) and forming bonds is exothermic (it releases energy) it would be the amount of energy it absorbed minus the amount of energy it released by breaking/forming the bonds in the reaction giving you the overall change of the H for the reaction. Hope this made sense.

especially after 5 edits of me reversing stuff :D

Edited by Drake Glau

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