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If it asks you for the standard enthalpy of a reaction then it will be in kj bc you can't really have moles of a reaction. If it's the standard enthalpy of FORMATION then it is kj/mol bc that is the enthalpy change that occurs when one mole of that molecule is formed.
If it is standard reaction enthalpy, it may say kJ or kJ/mol, but it is implied that the standard reaction enthalpy given is for one "mole" of reaction. You can't really have a mole of a reaction, so this just means that the given standard reaction enthalpy is the enthalpy proportional to the moles of each compound given. If you multiply the reaction by a coefficient of 2, you will have to multiply the standard reaction enthalpy by 2 as well. It follows the same rules as used in Hess's Law. Hope this helps!
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