CH 2 - Amount of Substance

AQA A-Level Chemistry

Relative atomic mass

the weighted mean mass of an atom of an element relative to 1/12 the mass of a carbon-12 atom

Relative molecular mass

the weighted mean mass of a molecule relative to 1/12 the mass of a carbon-12 atom

Mole

amount of substance that contains 6.022 × 10²³ particles

Avogadro’s constant

the number of atoms in 12g of carbon-12, which is 6.022 × 10²³

Empirical formula

the simplest whole number ratio of atoms of each element in a molecule

Molecular formula

the actual number of atoms of each element in a molecule