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A .500 cm diameter sphere is gold plated. The gold is Au +3, current is 5...

A .500 cm diameter sphere is gold plated. The gold is Au +3, current is 5 amps. The coat is a thickness of .0750 micron, density of gold is 19.31 g/cm^3. How long will it take to coat? Correct answer is 28 minutes apparently but how???

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