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December 2, 2016

Homework Help: Chemistry

Posted by Tom on Monday, April 5, 2010 at 11:09pm.

Why do we have these two equations:

ΔH° = ΣD (bond broken) – ΣD (bond formed)

and

ΔH = Σ ΔHf products - Σ ΔHf reactant

I don't understand when we use which one and why?
Please help. Thanks.

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