a thin circular-disk earning,5.00 cm in diameter is plated witha coating of gold 0.20 mm thick from an Au+3 bath.
a) how many days does it take to deposit the gold on one side ofthis earring if the current is 0.010 Ampere (d of Au = 19.3g/cm3)
b) how many days does it take to deposit the gold on both sidesof a pair of these earrings
c) if the price of Au is $320 per troy ounce 31.10 grams), whatis the total cost of the gold plating?
