Author Question: Gold is produced electrochemically from an aqueous solution of Au(CN)2 containing an excess of CN. ... (Read 92 times)

geodog55 · **on:** Mar 21, 2021

Question 1

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 0.56 gram of gold, passing a current of 0.10 amperes. (1 faraday = 96,485 coulombs)

◦ 23 hours
◦ 2.3 hours
◦ 46 minutes
◦ 15 minutes
◦ None of these are correct.

Question 2

Gold is produced electrochemically from an aqueous solution of Au(CN)₂^– containing an excess of CN^–. Gold metal and oxygen gas are produced at the electrodes. How many moles of O₂ will be produced during the production of 1.00 mole of gold?

◦ 0.25
◦ 0.50
◦ 1.00
◦ 3.56
◦ 4.00

Animal_Goddess · **Reply #1 on:** Mar 21, 2021

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