Where can formula mass be applicable?

Answer:

Formula mass is defined as the sum of atomic weights of the atoms in the empirical formula. Formula mass is applicable in the case of ionic compounds.

Example

  • Ionic compound like sodium chloride do not contain discrete molecules as their constituent units.
  • In such compounds, positive (sodium) and negative (chloride) entities are arranged in a three-dimensional structure.
  • The formula such as NaCl is used to calculate the formula mass instead of molecular mass as in the solid state sodium chloride does not exist as a single entity.

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