CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
A student is shown a 1 mol sample of hydrogen gas and a 1 mol sample of oxygen gas at the same temperature and pressure. The two gas samples occupy the same volume but have very different masses. Suggest, in terms of the mole and the Avogadro constant, why the two samples have the same volume but different masses.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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