A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Oct/Nov 2025 · Q31 Mark
The reaction of hydrogen sulfide with sulfur dioxide gives sulfur as one of the products. The two relevant redox equations are shown. H2S(aq) S(s) + 2H+(aq) + 2e¯ SO2(aq) + 4H+(aq) + 4e¯ ⇌ S(s) + 2H2O(I) How many moles of hydrogen sulfide are needed to react with sulfur dioxide to produce 1 mol of sulfur?
A1 mol
B2 mol
C3 mol
D2 mol
✓ Correct answer
B: 2 mol
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