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  4. How long a current of 3 amperes has to be passed through a solution of AgNO3 to coat a metal surface of 80 cm2 with a 0.005 mm thick layer. (Density of Ag is 10.5 g cm- 3 ).

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Q. How long a current of 3 amperes has to be passed through a solution of $AgNO_{3}$ to coat a metal surface of 80 $cm^{2}$ with a 0.005 mm thick layer. (Density of Ag is 10.5 g $cm^{- 3}$ ).

NTA AbhyasNTA Abhyas 2020Electrochemistry

Solution:

Weight of Ag deposited = Volume $\times $ density

$=\left(\right.Area\times thickness\left.\right)\times density$

$=80\times 5\times 10^{- 11}\times 10.5=0.42$ g

$t=\frac{W \times F}{E \times i}=\frac{0.42 \times 96500}{108 \times 3}=125.09$ sec.