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I believe that in both cases, gibbs free energy is measured in kJ overall. The only time I think Gibbs free energy is measured in kJ/mol is when you have to use the delta G reaction formula that requires the delta G (products) - delta G (reactants). The individual compounds in the reaction will be measured in kJ/mol, but eventually the mol will cancel out since you are multiplying by the amount of moles in the rxn.
I believe Gibbs Free Energy should almost always be measured in kj overall, however if the question asks for the Standard Gibbs Free Energy of formation of the reaction then the units should be kj/moles. Hope this helps!
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