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Chromium metal is electroplated using an...

Chromium metal is electroplated using an acidic solution containing `CrO_3` according to the following equation:
`CrO_3(aq)+6H^+6e^(-)rarr Cr(s)+3H_2O`
Calculate how many grams of chromium using 12.5 A current ? [Atomic mass of `Cr= 52 g mol^(-1),1F=96000 C mol ^(-1)]`

Text Solution

Verified by Experts

Molar of Cr=52 g Equivalent mass of `Cr=52/6`
(i) Mass of Cr deposited on passing 24000 coulumbs `=24000/96500xx52/6g=2.115g`
(ii) Number of gram equivalent of `Cr=1.5/52xx6=9/52`
`implies` Coulumbs required for `1.5 g Cr=1.5/52xx6=9/52 implies `
`t=(9xx09500)/(52xx12.5)s=22.27 m `in
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