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How much electricity in terms of Faraday...

How much electricity in terms of Faraday is required to produce? (a) 20 g of Ca from molten `CaCl_2` (b) 40 g of Al from molten `Al_2O_3` Given: Molar mass of `Ca = 40 g mol^(-1)` Molar mass of Al-27 g `mol^(-1)`

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