Chemistry

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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

  • Chemistry -

    I don't like any of the choices; however, B, C, and D are cockeyed answers so I would pick A. The reason I don't like A is because it also makes it possible for simple reactions.

  • Chemistry -

    It is A

  • Chemistry -

    A
    A
    B

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