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Formula units is the number of atoms in in a certain quantity of a compound. In this case, you would simply need to cover .750 mol into number of atoms thus multiplying it by (6.023 x 10^23 atoms/mol) -- or Avogadro's constant
I think formula units is a name for units in an ionic compound, while atoms refers to that of an element by itself, and molecules refers to that of a covalent compound. You would multiply it by avogadro's number the same way with anything else. So it would be .750 mol KNO3 x (6.022x10^23 formula units/ 1 mol KNO3).
Formula units is used for ionic compounds, but it uses the same avagadro's number as if you were finding the number of atoms. When a problem asks for the formula units, it is essentially asking for the number of atoms.
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