The mole and the Avogadro constant

The Avogadro constant as the number of particles in a mole.

The mole as applied to electrons, atoms, molecules, ions, formulas and equations.

The concentration of a substance in solution, measured in mol dm-3.

[Students will not be expected to recall the value of the Avogadro constant]

Assessment and practical skills

Students should be able to carry out calculations:
• using the Avogadro constant
• using mass of substance, M and amount in moles
• using concentration, volume and amount of substance in a solution.