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How Much Electricity in Terms of Faraday is Required to Produce - Chemistry

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How much electricity in terms of Faraday is required to produce :

(a) 20 g of Ca from molten CaCl2                     

(b) 40 g of Al from molten Al203

(Given : Molar mass of Calcium and Aluminium are 40 g.mol-1 and 27 g.mol-1 respectively.)

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Solution

a)

Electricity required to produce 40g of calcium = 2F

Therefore, electricity required to produce 20 g of calcium

`=(2xx20)/40F`

=  1 F

b)

Electricity required to produce 27g of Al = 3 F

Therefore, electricity required to produce 40 g of Al

`=(3xx40)/27F`

= 4.44 F

Concept: Electrolytic Cells and Electrolysis - Introduction
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