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Comparing the enthalpy change between the formation of water in two states

Since enthalpy is Q at constant pressure the PV factor can be ignored [this is for the questioner]. The difference is the heat of condensation of the vapor that is released. Therefore the reaction to ...
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How do I calculate enthalpy change calculations questions?

You divide by 0.1 mol only. Think of it this way. Let's change this question to using 0.1 mol $\ce{KOH}$ and 0.2 mol $\ce{HNO3}$. Technically, this reaction should only produce $\pu{5200 J}$ still ...
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