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Electrolysis and Faraday's Law

AP Chemistry· difficulty 4/5

Al³⁺ + 3e⁻ → Al(s); F = 96500 C/mol; Al = 27.0 g/mol; current = 10.0 A; t = 965 s.

+ − DC source Hall-Héroult cell (Al³⁺)

What mass of Al is produced?

  • A

    ~27 g

  • B

    ~0.90 g

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  • C

    ~9.0 g

  • D

    ~3.0 g

Explanation

Q = (10.0)(965) = 9650 C; mol e⁻ = 9650/96500 = 0.100; mol Al = 0.100/3 ≈ 0.0333; mass = 0.0333×27.0 ≈ 0.90 g.

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