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The values of enthalpy given in tables is in kJ/mol, since these values don't assume anything about the scale of your reaction. Similarly, if a problem simply asks for the enthalpy of a reaction without specifying mass or moles, then the answer will be in kJ/mol. But if for example the problem says that 2 moles of octane are burned, but in your balanced reaction the coefficient of octane is 1, then you should multiply the enthalpy in kJ/mol by 2 mol to get something in just kJ.
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