Gold (Atomic Mass = 197 G/mol) Is Plated from a Solution

question 59

Multiple Choice

Gold (atomic mass = 197 g/mol) is plated from a solution of chlorauric acid, HAuCl₄; it deposits on the cathode. Calculate the time it takes to deposit 0.55 g of gold, passing a current of 0.12 amperes. (1 faraday = 96,485 coulombs)

• A) 0.0018 days
• B) 0.62 h
• C) 1.9 h
• D) 2.5 h
• E) 1.2 h

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