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  4. How much electricity is required to produce 5.4 g of Al from Al2O3.

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Q. How much electricity is required to produce 5.4 g of Al from $Al_2O_3$.

Solution:

$Al^{3+} +3e^- \rightarrow Al$
27 g Al deposite by = 3 F
87. 5.4 g Al will deposit by = 0.6 F