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In support of all the students who are displaced from school due to the Corona virus. Access to physics zone and chemistry zone lessons are now available free of charge. This will be maintained at least through August 1st 2020. Learn and be well.

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?

Strategy:

  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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