Electrolysis and Faraday's Law

AP Chemistry· difficulty 4/5

To deposit 31.75 g Cu from CuSO4_4 at a current of 5.00 A requires how much time? (M(Cu) = 63.5)

  • A

    5360 s

  • B

    19300 s (t=nFz/It = nF \cdot z / I with z=2)

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  • C

    9650 s

  • D

    1930 s

Explanation

Moles Cu = 31.75/63.5 = 0.500. Moles e⁻ = 1.00. Charge q = (1.00)(96500) = 96500 C. t = q/I = 96500/5.00 = 19300 s ≈ 5.36 hours.

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