題組內容

31. The questions from 31a to 31d share the same conditions. The experiment of determining the chemical formula of magnesium oxide.

31c. When magnesium is burnt in air, some of it reacts with nitrogen to form magnesium nitride according to the equation:
3 Mg(s) + N₂(g) → Mg₃N₂(s)
Evaluate whether this, rather than the loss of product, could explain the yield found in (c). [1 mark]