**Molecular formula** is a chemical formula that **gives the total number of the atoms** of elements in a compound.

**Empirical formula** is a chemical formula that **gives the relative proportions of elements** in a compound but not the actual number of atoms of elements in a compound.

In this problem, **we are provided with mass percentages of C and H** for styrene. We will **calculate the empirical formula through these steps**:

- Dividing the percentages of C and H by their average atomic masses.
- Dividing the obtained numbers by the smallest number among them.
- Rounding off the final numbers to get coefficients of C and H.

Determine the empirical and molecular formulas of each of the following substances.

Styrene, a compound substance used to make Styrofoam^{®} cups and insulation, contains 92.3% C and 7*.*7% H by mass and has a molar mass of 104 g/mol.

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What scientific concept do you need to know in order to solve this problem?

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