Gold (Atomic Mass = 197

question 104

Multiple Choice

Gold (atomic mass = 197.0) is plated from a solution of chloroauric acid,HAuCl₄;it deposits on the cathode.Calculate the time it takes to deposit 0.30 gram of gold,passing a current of 0.10 amperes.(1 faraday = 96,485 coulombs)

• A)12 hours
• B)1.2 hours
• C)24 minutes
• D)8.2 minutes
• E)none of these

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