3.3 Mass Percents and Empirical and Molecular Formulas

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Mass Percent
Molecular Formula Most reduced integer ratio of atoms in a compound
Empirical Formula Ratio of the actual number of atoms per molecule of a compound. It is either the same or a multiple of the empirical formula.

You have 300g of CaCO3. What is the percentage of carbon in the sample? What is the %O?

A certain compound is 80.0% carbon and 20.0% hydrogen by mass. What is its empirical formula? If the compound above has a molecular weight of 30a.m.u., what is its molecular formula?