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Even though the toxicity of cadmium has become a concern, nickel-cadmium (nicad) batteries are still used commonly in many devices. The overall cell reaction isCd(s) + 2NiO(OH)(s) + 2H₂O(l) → 2Ni(OH)(s) + Cd(OH)₂(s) A certain nicad battery weighs 18.3 g and has a capacity of 300. mA?h (that is, the cell can store charge equivalent to a current of 300. mA flowing for 1 h).(a) What is the capacity of this cell in coulombs?

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tanisharawat014

The  capacity of the cell is 1080 C .

Given ,

the cell reaction is :

Cd(s) + 2NiO(OH)(s) + 2H2O(l) ==> 2Ni(OH)(s)+ Cd9OH)2(s)

A certain nicad battery weighs 18.3g and has a capacity of 300 mA hr.

That means ,

Current = 300 mA = 300 ×10^-3 C/sec

Time = 1hr = 3600 sec

Then ,

The  capacity of cell

= 300×10^-3C/sec ×(3600sec) =1080 C

Hence , the capacity of the cell is 1080 C .

Nickel-Cadmium battery :

It is becoming more popular in calculators, hearing aids, etc.

It is rechargeable cell. it has longer life as compared to lead storage cell.

In this cell, the anode is cadmium electrode.

The cathode is a metal grid containing NiO2 immersed in KOH solution.

In Ni-Cd storage cell, no ions are involved in the overall reaction. Thus, the cell potential remain constant for a long time and does not fall with time.

Learn more about capacity here :

brainly.com/question/16896465

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