In the commercial preparation of aluminum, aluminum oxide (Al2O3) is electrolyzed at 1000oC. How many coulombs of electricity are required to give 54 kg of aluminum? Assume following reaction takes place at cathode :Al3++3e−⟶Al

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17.3 x 108

3.21 x 107

1.82 x 104

57.6 x 107

answer is D.

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Detailed Solution

Q=WFAn =WFnA Q=54×103×96500/27 Q=579000,000 Q=57.9 ×107

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