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Yeah as Rosemary said, formula unit refers to the empirical formula of a compound, or the lowest ratio of ions in an ionic compound. For example, NaCl is the formula unit of table salt/sodium chloride. Other compounds like NH4NO2 are a little more complicated, since one might think it could just be simplified down to NH2O. Since we need to show the different ions, however, the notation must remain as is.
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