One faraday of electricity deposits one mol of Na from the molten salt but `(1)/(3)` mol of Al from an aluminium salt. Why?

One faraday of electricity deposits one mol of Na from the molten salt

1.	One faraday of electricity deposits one mol of Na from the molten salt but `(1)/(3)` mol of Al from an aluminium salt. Why?
Answer» The reactions at cathode for the deposit of Na and Al are `Na^(+)+e^(-)toNa and Al^(3+)+3e^(-)toAl` Thus, 1 faraday deposits 1 mol of Na whereas 3 faradays are required for depositing one mol of Al.

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One faraday of electricity deposits one mol of Na from the molten salt but `(1)/(3)` mol of Al from an aluminium salt. Why?

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