Posted by **Samantha Taylor Greenfield** on Friday, May 9, 2014 at 3:44pm.

Hess's law ____.

A) makes it possible to calculate ΔH for complicated chemical reactions

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

C) determines the way a calorimeter works

D) describes the vaporization of solids

Highly confused for this question, I originally thought B but, doesn't the sign of ΔH change?

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