How long a current of `3A` has to be passed through a solution of `AgNO_(3)`, to coat a metal surface of `80 cm^(2)` with `5 mum` thick layer? Density of sikver `= 10.8 g//cm^(3)`

Answer

`t = 128.66 sec`

Explanation

`d=(M)/(V) rArr 10.8 =(M)/(80 "cm"^(2) xx 5xx 10^(-4) "cm")`
`m_(Ag)=0.432`
`n_(Hg)=4 xx 10^(-3)`
`Ag^(+)+e^(-)rarr Ag`
`n_(Ag) =n_(e^(-)) rarr Ag`
`n_(Ag)=n_(e^(-))=4 xx 10^(-3)`
`q = 4 xx 10^(-3) xx 96500`
`q = 386`
`I = (q)/(t), t = 128.665`.