The term “molecular” mass cannot be used for ionic compounds because they do not consist of discrete molecular units , instead the term Emperical formula mass is used.
- Molecular mass is the mass of a molecule that is equal to the sum of atomic masses of all the atoms contained in the molecule. Example- molecular mass of Water( H2O)=2x1+16=18u
- Emperical formula mass of a substance is the sum atomic masses of
constituent atoms in an ionic compounds.Ionic compounds which do not contain discrete molecules, but ions as their constituent units.
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