Question

A current of 5.76 A is passed through a Cu(NO3)2 solution. How long, in hours, would this current have to be applied to plate out 8.70 g of copper

Answer 1

First, find moles of copper (8.70g/63.55g/mol). Then, use Faraday's Law to calculate time.
After that, divide total moles by current (in Coulombs/sec) and convert to hours.
Finally, divide by 3600 to get the result in hours. That's it!