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Calculate the time required to coat a me...

Calculate the time required to coat a metal surface of 50 cm2 with `0.01 mm` thick layer of chromium (density = 7.19 g cm-3) by the passage of 5 A current.

Text Solution

Verified by Experts

Volume of of chromium layer =` 0.01 xx 10^(-1) cm xx 50 cm^(2) = 0.05 cm^(3)`
Mass = volume x density = `7.19 xx 0.05 = 0.3595` g
Equivalent mass of chromium = 51.996/6 = 8.67
`W=(8.67)/(96500)xx5xxt rarr 0.3595 =(8.67)/(965000)xx5xxt`
`t=(0.3595xx96500)/(8.67xx5)=800.27` seconds
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