One mole of oxygen and one mole of carbon dioxide have the same volume at room temperature and pressure.
Which statement explains why the two volumes are the same?
They contain the same number of atoms.
They have the same relative formula mass.
They contain the same number of molecules.
They contain the same mass of gas.
40 exam-style questions on AQA GCSE Chemistry 3.5 Use of amount of substance in relation to volumes of gases, covering 3.5.1 Volumes of gases. Each one has a worked solution and a mark scheme showing where the marks go.