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I think that the unit should just be kJ/mol, because I think that adding or removing something from a unit would make things weird and even the unit invalid. If you want specify that you are calculating enthalpy of formation of a particular substance, you could specify that at the beginning of your equation, right after delta H rxn and before the = sign.
805097738 wrote:do you have to explicitly state per mole or is that implied already
You should explicitly state it per mole in the case of standard reaction enthalpy or standard formation enthalpy because those are definitionally for one mole of a compound. I guess it's mostly for the consistency of units, though.
Yes, for the heat of reaction, you must state it in kj/mol because in a reaction, there could be 2 moles of a reactant being used to form a product, and in that case, the per mole part of the heat of reaction matters, because in that case you must divide the amount of heat by two. So yes, the per mole of reactant or product matters.
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