1. The problem statement, all variables and given/known data I need to research Hess' law, but I can't find a simple explanation. I know that the enthalpy change between the reactants and products is the same as the enthalpy change between the reactants and something else, and between that something else and the products, but I don't know what this something else is. 2. Relevant equations None I know 3. The attempt at a solution I looked online, but it went into great detail about it.