Chemistry  Electroplating  URGENT
posted by Em on .
"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat."
This is what I have so far
96,485 coulombs are required to plate 1 Cr; 52/6 = 8.67g.
To plate 200g:
96.485 * (200/8.67) = 96.485 * 23.068 C = 2,225.721 coulombs
1 A = 1 C/s
(amperes) x (time) = 2,225.721 coulombs.
I know this may seem stupid but I can't seem to remember how to determine amps. Please help.

I believe you should have divided 52 by 3; the electroplating probably goes from Cr^3+ to Cr which is a change of 3 electrons.
Then coulombs needed = 96,485 x (200/17.3) = ?
C = amps x seconds but you have two unknowns. You don't know amps (usually given in the problem) or seconds (which is what the problem is asking). 
Ahh thank you  so then there would be 8346.453 coulombs needed instead of 2225.721.
As there are two unknowns, I cannot solve this problem any further... this is for an assignment due tomorrow, what should I do? 
Sorry that should say 1115433.526 coulombs, not 8346.453.