A. Hess\'s Law. Hess\'s law states that if you can add two or more thermochemical equations to produce a final equation for a reaction, then the sum of the enthalpy changes for the individual reactions is the enthalpy change for the final reaction. 2S(s) 3O2(g) ? 2SO3(g) ?H = ?. A. Hess\'s Law. A. Hess\'s Law.
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