A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Oct/Nov 2022 · Q41 Mark
Calcium oxide and magnesium sulfide each react with acid. CaO(s) + 2H+(aq) → Ca²+(aq) + H2O(l) MgS(s) + 2H+(aq) → Mg2+(aq) + H2S(g) A mixture of these two compounds, X, reacts with exactly 0.125 mol of dilute hydrochloric acid. The amount of hydrogen sulfide formed is 0.0250 mol. What was the mass of calcium oxide in mixture X?
A1.4 g
B2.1 g
C2.8 g
D4.2 g
✓ Correct answer
B: 2.1 g
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