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CAIE IGCSE Chemistry 3.3.4 Molar gas volume, taken as 24 dm3 at

Practise applying 24 dm3 per mole at r.t.p. to gas volumes, equations and particle numbers in reactions involving gases.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • convert gas volumes in cm3 or dm3 at r.t.p. into moles using 24 dm3 per mole
  • use balanced equations to link gas volume to reactant or product amounts
  • calculate molecules in a gas sample by combining molar gas volume with Avogadro constant

3.3.4—Molar gas volume, taken as 24 dm3 at question 1

[Maximum number: 1]

Hydrogen peroxide, H2O2\mathrm{H}_{2} \mathrm{O}_{2}, decomposes into water and oxygen in the presence of a catalyst, manganese(IV) oxide.

2H2O2(aq)→2H2O(l)+O2( g)2 \mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{O}_{2}(\mathrm{~g})

Calculate the volume (at r.t.p.) of oxygen produced.
dm3\mathrm{dm}^{3}

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