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For some reason I can never do these problems properly. For bond enthalpies, do the broken bonds have their values negated or do the formed bonds have their enthalphy negated? Sorry if it's a dumb question but thank you in advance everyone.
It is the sum of bonds broken minus the sum of bonds formed. It takes energy to break bonds so it would have a positive value. However, when bonds form, they become more stable and thus release energy giving a negative value. Hope this helped!
Bond enthalpies are the energy required to break a bond, so the bonds that are broken should stay positive, while the bonds that are formed need to be negated (since forming bonds releases energy). The addition of these positive (broken bonds) and negative (formed bonds) values are the ∆H of reaction.
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