Learning objectives
State that the mole is the unit of amount of substance, that one mole contains 6.02 × 10²³ particles (the Avogadro constant) and that the mass of one mole of a substance in grams equals its Ar or Mr
Use amount (mol) = mass (g) ÷ molar mass (g/mol), the Avogadro constant and the molar gas volume of 24 dm³ at room temperature and pressure to convert between moles, masses, numbers of particles and gas volumes
Calculate concentrations of solutions in mol/dm³ and g/dm³, convert between the two, and solve titration problems to find an unknown concentration or volume
Calculate reacting masses and gas volumes from a balanced equation and identify the limiting reactant in a reaction
Calculate percentage yield, percentage composition by mass and percentage purity
Define empirical formula as the simplest whole-number ratio of atoms or ions in a compound, and deduce empirical and molecular formulae from reacting masses, percentage compositions and the relative molecular mass
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