Hess's Law of Constant Heat Summation Chemistry Tutorial Key Concepts. Hess's law of constant heat summation is more commonly known as Hess's law. Hess's Law states that the change in enthalpy for any reaction depends only on the nature of

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So this is the sum of these reactions. Its change in enthalpy of this reaction is going to be the sum of these right here. That is Hess's Law. So this is the fun part. So we just add up these values right here. So we have negative 393.-- no, that'