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Brass is an alloy of copper and zinc with smaller amounts of lead, tin, and other...

Brass is an alloy of copper and zinc with smaller amounts of lead, tin, and other elements. Generally, copper can be separated from the other components by electrolysis. A sample of brass is analyzed for copper by electrogravimetry. A portion of the alloy weighing 2.1049 g is dissolved in nitric acid, and the copper is plated onto a platinum gauze cathode weighing 13.4963 g. After electrolysis is complete, the cathode is removed from the solution, washed, and dried. It now weighs 14.7402 g. Calculate the percentage of copper in the brass sample.

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