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3.3 The mole and the Avogadro constant

Syllabus
0620–2026–2027
Topic
3.3
Level
—

3.3.1—Concentration can be measured in g/dm3

  • State: concentration can be measured in g/dm³ or mol/dm³

3.3.2—Mole, mol, is the unit of amount of

  • State: the mole, mol, is the unit of amount of substance and that one mole contains 6.02 × 1023 particles, e.g. atoms, ions, molecules; this number is the Avogadro constant

3.3.3—Amount of substance relation: amount

  • Use amount of substance relation: amount (mol) = mass (g) / molar mass (g/mol), to calculate amount, mass, molar mass, relative mass and particle number using Avogadro constant

3.3.4—Molar gas volume, taken as 24 dm3 at

  • Use the molar gas volume, taken as 24 dm³ at room temperature and pressure, r.t.p., in calculations involving gases

3.3.5—Stoichiometric reacting masses

  • Calculate stoichiometric reacting masses, limiting reactants, volumes of gases at r.t.p., volumes of solutions and concentrations of solutions expressed in g/dm³ and mol/dm³, including conversion between cm 3 and dm³

3.3.6—Experimental data from a titration to

  • Use experimental data from a titration to calculate the moles of solute, or the concentration or volume of a solution

3.3.7—Empirical formulae and molecular

  • Calculate empirical formulae and molecular formulae, given appropriate data

3.3.8—Percentage yield, percentage

  • Calculate percentage yield, percentage composition by mass and percentage purity, given appropriate data

Objective notes

8 learning objectives
ConceptIGCSE Chemistry