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When calculating the delta H why do we do the delta H products minus reactants oppose to just using the sum of the enthalpies like the questions previously. Like in questions 4J.5 we just use the products delta H when finding Gibbs.
And question 4J.5, it was asking for the formation of NH3 for (a), which is given by N2(g) + 3H2 (g) --> 2NH3 (g). You still standard enthalpy of formation of products - standard enthalpy of formation of reactants, but the standard enthalpy of the reactants is 0.
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