Chemistry 0620 · IGCSE · The mole and the Avogadro constant
The mole and the Avogadro constant — practice question
Calcium chloride may be prepared by reacting calcium carbonate with hydrochloric acid.
$\text{CaCO}_3(s) + 2\text{HCl}(aq) \rightarrow \text{CaCl}_2(aq) + \text{H}_2\text{O}(l) + \text{CO}_2(g)$
An excess of calcium carbonate was added to $50.0\,\text{cm}^3$ of $0.500\,\text{mol dm}^{-3}$ hydrochloric acid. The mixture was then filtered so that the surplus calcium carbonate was removed.
(a)[2]
How many moles of HCl were consumed in this reaction?
(b)[1]
Deduce the number of moles of carbon dioxide gas formed in this reaction.
(c)[2]
Calculate the mass of carbon dioxide formed in this reaction.
(d)[1]
Calculate the volume, in $\text{dm}^3$, of carbon dioxide formed in this reaction at room temperature and pressure (r.t.p.).
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “50 / 1000 = 0.05.” …