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Supplement. (a) What volume does one mole of a gas take up at r.t.p.? (b) One mole of hydrogen has a mass of 2 g and one mole of carbon dioxide 44 g. Explain why they take up the same volume at r.t.p.
state: give a concise answer. explain: give reasons and connect them to evidence.
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Scope and sources
Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.
Moles in equations (3.3 Supplement 4, 5, 7 and 8): the molar gas volume of 24 dm³ at r.t.p., reacting masses, volumes of gases and volumes of solutions from equations, limiting reactants, percentage yield, composition by mass and purity, and empirical and molecular formulae. The mole, n = m/M and concentration are in the previous module; titration is left to topic 12.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus