May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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9Mass CalculationsHard1 mark
Magnesium reacts with steam to form hydrogen.
How many molecules of hydrogen gas are made when 3.6 g of magnesium are heated with 1.8 g of steam? (Assume Avogadro's constant = and the yield of magnesium oxide is 100%.)