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Yeah I believe that Christina is correct. The overall enthalpy of a chemical reaction should be measured in kJ while other enthalpies for specific chemical species should be measured in kJ/mol unless specified.
When dealing with the singular unit kJ, we typically refer to the amount of energy that is involved in the system, whether it be the formation of products, reactants, or the total amount of energy that was released or absorbed based on the amount of substance in the reaction. On the other hand, kJ/mol refers to the amount of energy lost or gained for a particular compound per mole. For instance when delta H of formation of NO2 = 34kJ/mol means that its takes 34 kJ of energy to form 1 mole of NO2.
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