The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 amp is
[At., mass of Ca = 40]

Options

A. 8
B. 80
C. 10
D. 16

Answer

A

Explanation

`w = Z xx I xx t`
`30 = (Eq. wt)/(96500) xx 5 xx t`
Eq. wt = `(40)/(2) " " [Ca^(2+) + 2 e^(-) to Ca]`
`30 = (40)/(2 xx 96500) xx 5 xx t`
`t = (30 xx 2 xx 96500)/( 40 xx 5)`
`t = 28950 s = (28950)/(3600) = 8` hours