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in Electrochemistry by (33.4k points)
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How much electricity in Faraday is required to produce

1. 20.0 g of Ca from molten CaCl2 ?

2. 40.0 g of Al from molten Al2O3 ?

1 Answer

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Best answer

1. The electrode reaction is

Ca2+(aq) + 2e- → Ca(s)

Electricity required to produce 40 g Ca = 2 F

Electricity required to produce 20 g Ca = 1 F

2. The electrode reaction is

Al3+(aq) + 3e- → Al(s)

Electricity required to produce 27 g of Al = 3 F

Electricity required to produce 40 g Al = \(\frac{3F\times 40}{27}\)

= 4.44 F

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