Chemistry
posted by Brianna .
A current of 3.94 A is pass through a Pb(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 5.40 g of lead?

3.94 x seconds = coulombs
You want to know seconds (and convert to hours).
96,485 coulombs will plate out 207.2/2 = 103.6g Pb.
So how many coulombs do you need? That's 96,485 x 5.40/193.6 = ?
Substitute that ? into coulombs above, solve for seconds and convert to hours.