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Electrochemistry

Question

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Aluminium oxide may be electrolysed at 1000^o C to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is

Al³⁺ +3e^- → Al^oTo prepare 5.12 kg of aluminium metal by this method would require

5.49 x 10⁷ C of electricity

1.83 x 10⁷ C of electricity

1.49x 10⁷ C of electricity

5.49 x 10¹ C of electricity

Solution

A.

5.49 x 10⁷ C of electricity

straight Q space equals space mFZ over straight M space equals space fraction numerator 5.12 space straight x space 10 to the power of 5 space straight x space 96500 space straight x 3 over denominator 27 end fraction space equals space 5.49 space straight x 10 to the power of 7 space straight C

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