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Chromium metal can be plated out from an...

Chromium metal can be plated out from an acidic solution containing `CrO_(3)` according to the following equation: `CrO_(3)(aq)+6H^(+)(aq)+6e rarr Cr(s)+3H_(2)O` (2) How long will it take to plate out 1.5 g of chromium by using 12.5 A current?

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`CrO_(3)(aq)+6H^(+)(aq)+6e rarr Cr(s)+3H_(2)O`
52 g of Cr is deposited by `6xx96500C` of electric current.
`" "[because " atomic mass of Cr = 52 g.mol"^(-1)]`
(2) According to Faraday's 1st law, `W=Z xx I xxt`
`therefore" "1.5=Z xx12.5xxt" or, "1.5=(52)/(6xx96500)xx12.5xxt`
`"or, "t=(1.5xx6xx96500)/(52xx12.5)=1336.15`
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