How much electricity in Faraday is required to produce1. 20.0 g of Ca

1.	How much electricity in Faraday is required to produce1. 20.0 g of Ca from molten CaCl2 ?2. 45.0 g of Al from molten Al2O3 ?(Hint: Atomic masses – Ca: 40 u, Al: 27 u)
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 45 g Al = 5 F

How much electricity in Faraday is required to produce1. 20.0 g of Ca from molten CaCl2 ?2. 45.0 g of Al from molten Al2O3 ?(Hint: Atomic masses – Ca: 40 u, Al: 27 u)

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 45 g Al = 5 F

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