How much electricity in terms of Faraday is required to produce i. `20.0 ~g` of `Ca` from `molten CaCl_2 ?` ii. `40.0 ~g` of Al from molten `Al_2 O_2` ?

Explanation

i. `Ca^2++2 e Ca`
`2 F` can producé `i` mole `(=40 g)` Ca `therefore` To produce `20 ~g` Carequires.
`2 F xx 20/40=1`
ii. `A I^prime *+3 e^prime stackrelA l/ `
`3 ~F` can produce `[` mole `(=27 ~g) A` `therefore` To produce `40 ~g` Al requires
`3 E xx 40/27=4.44 ~F`