Practice question
Question
In electrolysis of molten MgCl₂, 0.24 g of Mg (atomic mass 24 g/mol) is deposited. What volume of Cl₂ gas (STP) is produced at the anode? (F = 96500 C/mol)
Explanation
Cathode: Mg²⁺ + 2e⁻ → Mg . Moles = (0.24/24) = 0.01 mol , Charge = 0.01 × 2 × 96500 = 1930 C . Anode: 2Cl⁻ → Cl₂ + 2e⁻ . Moles Cl₂ = 0.01 mol , Volume = 0.01 × 22.4 = 0.224 L .
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