Calculate the mass of iron(II) sulfate required to react with 200 ml of 0.1 M potassium dichromate in an acidic solution.
- 9.12 g
- 18.24 g
- 30.4 g
- 15.2 g
📝 Detailed explanation
Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ → 2Cr³⁺ + 6Fe³⁺ + 7H₂O.Moles K₂Cr₂O₇ = 0.2 × 0.1 = 0.02 mol.
Moles FeSO₄ needed = 0.02 × 6 = 0.12 mol.
Mass FeSO₄ = 0.12 × 152 = 18.24 g.