Electrolysis and Faraday's Law

AP Chemistry· difficulty 4/5

How many grams of copper are deposited by passing 9650 C of charge through CuSO4_4 solution? (M(Cu) = 63.5, F = 96500 C/mol)

  • A

    12.7 g

  • B

    1.59 g

  • C

    3.18 g (n = q/(zF) = 9650/(2×96500))

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  • D

    6.35 g

Explanation

Cu2+^{2+} + 2e⁻ → Cu. Moles e⁻ = 9650/96500 = 0.100. Moles Cu = 0.0500. Mass = 0.0500 × 63.5 = 3.175 g.

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