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I think that is the correct calculation because one mole contains Avogadro's number of any units, such as formula units. So one mole would be equal to 6.022*10^23 formula units. It would also be equal to 6.022*10^23 molecules. Also, from what I recall, formula units and molecules are pretty much the same, except formula units refer to ionic compounds, and molecules refer to molecular compounds.
Ionic compounds do not consist of individual molecules, but rather formula units. A formula unit is essentially the lowest reduced ratio of ions in the compound. It helps represents what atoms are present and in what ratio. when it comes to calculations, if you are trying to calculate the formula units, you would multiply moles by Avogadro's number to obtain your answer.
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