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I think it really depends on the context of the question and what you are trying to solve. Within the practice midterm kJ per mole is used which may be needed to be converted to Joules per photon with dimensional analysis to solve the problem. However overall, when stating an answer that has energy, the SI Unit for it will always be Joules.
I have also seen questions that give the work function in the units eV, and in that case just remember that you can convert from eV to Joules using the conversion factor give on the conversion sheet which is 1ev is equal to 1.602 × 10-19 J.
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