Tuesday
October 21, 2014

Homework Help: Chemistry

Posted by Anna on Saturday, April 3, 2010 at 11:58pm.

Why do we put a minus sing in front of the bond enthalpies of the bonds that are being formed?

And why are the enthalpies of formation negative in general?

I also don't understand why we subtract the enthalpy of formation of the reactants from the enthalpy of formation of the products?

Maybe someone could help me understand this.
Thanks!

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