Percentage Composition, Empirical and Molecular Formulas (VCE SSCE Chemistry): Quizzes

Proportion of total mass from each element

$\frac{\text{mass in 1 mol}}{\text{molar mass}} \times 100$

Simplest whole-number ratio of atoms

Ionic compounds

Obtain mass of each element (assume 100g)

$n(\text{H}) = 2 \times n(\text{H}_2\text{O})$

Molecular is a whole-number multiple

$\text{C}_6\text{H}_6$

Sodium hydroxide solution

To convert to the simplest ratio