posted by Samantha Taylor Greenfield on .
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?
true, that is why A is the correct choice