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When calculating for the change in enthalpy and canceling compounds, must they be on separate sides of the arrows in the two reactions? As in a compound in the reactant side cancels out when that same compound is on the product side of the other reaction.
Yes they have to be in the opposite side to be able to cancel out. You can think of it as an equation. You have to have 2 identical term in 2 sides of an equation to be able to cancel them out. Just make sure that they have the same number of mole.
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