November 27, 2015

Homework Help: Chemistry

Posted by Jack on Monday, March 4, 2013 at 11:52am.

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 me. I cannot fingure this out.

Thank You

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