An aqueous solution of an unknown salt of gold is electrolyzed by a current of 2.75 amps

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An aqueous solution of an unknown salt of gold is electrolyzed by a current of 2.75 amps for 3.50 hours. The electroplating is carried out with an efficiency of 90.0%, resulting in a deposit of 21.221 g of gold.
a. How many faradays are required to deposit the gold?
b. What is the charge on the gold ions (based on your calculations)?
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General Chemistry

ISBN: 978-1439043998

9th edition

Authors: Darrell Ebbing, Steven D. Gammon

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