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What current is required to electroplate 5.18 micrograms of gold in 30 minutes from

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a gold chloride aqueous solution? answer in units of A

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  1. Au3+ + 3e-  ==>  Au

    5.18 ug Au x (1 g / 10^6 ug) x (1 mole Au / 197.0 g Au) x (3 moles e- / 1 mole Au) x (96,500 C / 1 mole e-) = 0.00761 C

    30 min x (60 s / min) = 1800 s

    Amps = coulombs / s = (0.00761 / 1800) = 4.23 x 10^-6 A

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