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  • A layer of chromium met al 0.27 mm thick is to be plated on an auto bumper with a total area of <img alt="0.36 \mathrm{~m}^2" src="https://entrancecorner.oncodecogs.com/gif.latex?0.36%20%5Cmat

A layer of chromium met al 0.27 mm thick is to be plated on an auto bumper with a total area of 0.36 \mathrm{~m}^2 from a solution containing \mathrm{CrO}_4^{2-}. What current frow is required for this electroplating, if to be plated 60s ? {Density of Chromium metal \rightarrow 7.20 \mathrm{~g} / \mathrm{cm}^3}

Option: 1

105781


Option: 2

12477


Option: 3

24876


Option: 4

120254


Answers (1)

best_answer

Total Volume of metal layer
       0.27 \times 0.36 \times 10^{-3}

      =0.09 \times 10^{-3} \mathrm{~m}^3

 

Total mass of chromium layer
      0.09 \times 7.20 \times 10^6 \times 10^{-3}

      =648 \mathrm{~g}

\mathrm{ \frac{648}{52} \times 6 =\frac{I \times 60}{96500} }

\mathrm{ I =120254 }

 

Posted by

Pankaj Sanodiya

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