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Eletrochemistry help, an old classmate who works for eagle metals company on the night shift was supposed to?

Do this gold plating job wherein he put 4.5000 troy ounches of gold ( 1 troy ounce= 31.103 gram) on a medallion using the reaction, Au(CN)4(aq) +3e---->Au(s) +4CN- he somehow got 4.8527 troy ounces of gold on the medallion instead of the correct amount. please tell him how many hours and minutes he should run the cells with the leads reversed, using a current of 1.350A, to rectify the error and bring the medallions down to the correct weight.

First calcualte the overage of gold in the mistake:

4.8527 - 4.5000 = 0.353 troy ounces = 0.353 x 31.103 = 10.970 gram of Au

10.970 gram of Au or 10.970/196.966543 = 0.0557 moles of gold

To oxidize the gold, 3x moles of electrons are needed or 3 x 0.0557 = 0.1671 moles of electrons

Multiply by Farady's Contant to get the charge 0.1671 x 96,485.3365 C/mole = 16122.70

Q=It 16122.70 / 1.350 = 11943 seconds = 3 hours 19 minutes
Answered By: doc joe - 5/16/2012
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