Molecular Formulas

In today's class we learned how to make or get a molecular formula

Its basically if you know howto make a empirical formula you can find the molecular formula you need the molar mass
e.g. the empirical formula for a substance is CH20 and its molar mass is 60.0g/mol
Determine the molecular formula

Empirical
CH2O
30.0g/mol

Molecular
C2H4O2
60.0g/mol