Practice question
Question
During the electrolysis of aqueous CuSO₄ using copper electrodes, what mass of copper is deposited at the cathode if a current of 1 A flows for 965 seconds? (Faraday constant = 96500 C/mol, Atomic mass of Cu = 63.5 g/mol)
Explanation
Charge Q = I × t = 1 × 965 = 965 C . For Cu²⁺ + 2e⁻ → Cu , 2F (193000 C) deposits 63.5 g Cu. Mass = (63.5 × 965/2 × 96500) = 0.3175 g .
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