IGCSE Chemistry

2026 - 2028

Syllabus Checklist ✅

IGCSE Chemistry – The Mole Concept

Topic 7: The Mole Concept

Fundamentals

State that concentration can be measured in g/dm³ or mol/dm³
State that the mole (mol) is the unit of amount of substance and that one mole contains 6.02 × 10²³ particles (atoms, ions, or molecules); this number is the Avogadro constant

Quantitative Relationships

Use the relationship between amount of substance (mol) , mass , molar mass , and relative atomic or molecular mass to calculate:
(a) amount of substance
(b) mass
(c) molar mass
(d) relative atomic mass or relative molecular/formula mass
(e) number of particles , using the value of the Avogadro constant

Gas Calculations

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

Stoichiometric Calculations

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 cm³ and dm³
Use experimental data from a titration to calculate the moles of solute , or the concentration or volume of a solution

Empirical and Molecular Formulae

Calculate empirical formulae and molecular formulae , given appropriate data

Percentage Calculations

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

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