How long has a current of 3 ampere to be applied through a solution of silver nitrate to coat a metal surface of 80 cm2 with 0.005 cm thick layer density of silver is 10.5g/cm3.

Given Area = 80 cm³

   Thickness = 0.0005 cm

        Density= 10.5 gl cm³

Thus Mass of silver deposited on cathode is = 80 cm³ x 0.0005 cm x10.5 gm/cm³= 0.42 gm

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