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Science, Chemistry

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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?

  • Science, Chemistry - ,

    true, that is why A is the correct choice

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