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Sometimes you have to convert the units given to you in order to do the calculation correctly. For example, the specific heat capacity and the heat of fusion have different units, so in order to get both of them to kJ, you have to cancel out the units in each equation to be converted to kJ.
Also the kJ/mol represent the amount of energy for one mole of that compound so if you had to calculate the enthalpy of of a compound that had more than one mole of it in the chemical equation we would have to multiply the number of moles with the kJ/mol value to get the total enthalpy for that compound in the equation.
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