The required time it would take at a current of 3.5 amps to plate out 2.50 grams of gold is 1,049 seconds.
According to the faraday's second law, equation to calculate the time will be given below:
W = ZIt, where
W = deposit mass = 2.50 grams
Z = equivalent mass / 96500 = 65.6 / 96500 = 0.000679
I = current = 3.5 amp
t = required time = ?
On putting values in above equation, we get
t = (2.50) / (0.000679)(3.5)
t = 1,054 sec = 1,049 s (approx)
Hence required seconds to plate out 2.50 g of gold is 1,049 sec.
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