The first question i am having trouble with is : How long will it take to plate

Question

The first question i am having trouble with is :
How long will it take to plate 2 grams of gold (197 g/mol) from anAu3+ solution at a current of 5amps? also, if you can please be kind hearted to help me in... or ifit is the same format please tell me how to do it??? please! how long will it take to deposit one gram of Sn from a SNCL2solution at a current of 10 amps...? The first question i am having trouble with is :
How long will it take to plate 2 grams of gold (197 g/mol) from anAu3+ solution at a current of 5amps? also, if you can please be kind hearted to help me in... or ifit is the same format please tell me how to do it??? please! how long will it take to deposit one gram of Sn from a SNCL2solution at a current of 10 amps...?

Explanation / Answer

Au3+   + 3e-   -> Au Your clue is that you can related charge (electrons) to mass ofAu 2 g Au *(1 mol Au/197 g) *(3 mol e-/ 1mol Au) = 0.030457 molese- You know that 1 mole e- = 96485 C (Faraday's number) charge = 0.030457 moles e- *(96485 C/1mol e-) = 2938.629 C 1 amp = 1 C/s = charge/time = current time = charge /amps = 2938.629 C/(5 A) = 587.7 seconds b) Sn2+   + 2e-    -> Sn 1 g Sn *(1mol Sn/118.70 g) *(2 mol e-/1mol Sn) *(96485 C/1mol e-) =1625.695 C time = charge/current = (1625.695 C)/(10 Amps) = 162.6 seconds

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