Practice question
Question
In electrolysis of molten NaF, 0.23 g of Na (atomic mass 23 g/mol) is deposited. What volume of F₂ gas (STP) is produced at the anode? (F = 96500 C/mol)
Explanation
Cathode: Na⁺ + e⁻ → Na , Moles = (0.23/23) = 0.01 mol , Charge = 0.01 × 96500 = 965 C . Anode: 2F⁻ → F₂ + 2e⁻ , Moles F₂ = (0.01/2) = 0.005 mol , Volume = 0.005 × 22.4 = 0.112 L .
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