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Chemistry Lessons Review Links

Molecular Formula from Epirical Formula and Mass

This will guide you through determining the molecular formula of a compound just based on the mass of its parts and the empirical formula.

Molecular Formula: The actual formula for a molecule.

Problem: A compound has an empirical formula of ClCH2 and a molecular weight of 98.96 g/mol. What is its molecular formula?


  1. Find the mass of the empirical unit.
  2. Figure out how many empirical units are in a molecular unit.
  3. Write the molecular formula.

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