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Question

A 100 watt,110 volt incandescent lamp is connected in series with an electrolytic cell containing cadmium sulphate solution. What mass of cadmium will be deposited by the current flowing for 10 hours?

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Solution

We know that,
Watt=ampere×volt
100=ampere×110
Ampere=100110
Quantity of charge =ampere×second
=100110×10×60×60 coulomb
The cathodic reaction is:
Cd2+112.4 g+2e2×96500 CCd
Mass of cadmium deposited by passing 100110×10×60×60 coulomb charge
=112.42×96500×100110×10×60×60=19.0598 g.

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