February 23, 2017

Homework Help: Chemistry

Posted by Jack on Monday, March 4, 2013 at 2:21pm.

Hess's law _____.

A.) makes it possible to calculate H for complicated chemical reactions

B.) states that when you reverse a chemical equation, the sign of H does not change

C.) determines the way a calorimeter works

D.) describes the vaporization of solids

Please help - I think it is A

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