What this tests
Syllabus point 3.3 — The mole and the Avogadro constant, in Stoichiometry. Difficulty hard (estimated from the question's demands, not a Cambridge rating).
Also set in
The same question, as Cambridge printed it in other papers.
Cambridge IGCSE Chemistry 0620 · 3.3 The mole and the Avogadro constant
November 2019 · Paper 21 · Question 10
One real Cambridge question from Stoichiometry, with the official answer. Cambridge has printed this question 2 times.