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    I have been asked to calculate the molar enthalpy change of the reaction between Nitrogen and Hydrogen when producing Ammonia with respect to nitrogen, and draw an enthalpy diagram to represent the reaction.

    Now I'm confused about the "with respect to nitrogen" bit. (N2 in the equation is also in bold on my work sheet)

    So do I work out the enthalpy change for the whole reaction? Or do I only look at the breaking and making of bonds concerning nitrogen only?

    I also have to do one for the complete combustion of Ethane, but again it states "with respect to ethane". So do I ignore the breaking of the oxygen molecules in the calculation? Seems a bit silly as I would be including the making of bonds for oxygen as they react with carbon and hydrogen to make CO2 and water.
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