Chemistry / Chem 0364 · Atom · ~20 seconds
Formula Mass for Ionic Compounds
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An ionic compound's formula mass sums the average atomic masses of every ion shown in its formula unit, cation and anion together.
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Sodium chloride's formula mass adds sodium's average mass to chlorine's, since NaCl's formula unit contains exactly one of each ion.
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Ionic compounds form no discrete molecules, so their formula mass is never correctly called a molecular mass.