Relative Atomic Mass (OCR GCSE Chemistry A (Gateway Science Suite)): Quizzes

$\frac{1}{12}$ mass of carbon-12 atom

Abundance of each isotope

A weighted average of all isotopes

$Ar$ is weighted; mass number is one isotope

$10.8$

$35.5$

Different isotopes contribute to $Ar$

On the periodic table

Moles, empirical & molecular formulas

$\text{Moles} = \frac{\text{Mass}}{Ar \text{ or } Mr}$