What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to the mole and the avogadro constant. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on the mole and the avogadro constant, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Forgetting to divide cm³ by 1000 before using concentration × volume.
- Using 24 dm³ for a solid or a liquid. The molar gas volume applies to gases at r.t.p. only.
- Working the theoretical yield from the reactant in excess rather than the limiting one.
- Mixing g/dm³ and mol/dm³ in the same calculation without converting.
- Stopping the empirical formula calculation at step 1 without dividing by the smallest.
- Rounding part way through. Carry the extra figures and round only at the end.
- Treating any of this as Core material. Subtopic 3.3 is examined on Paper 2 only.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: The mole and the Avogadro constant revision notes.