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Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through molten Al2O3 for 6 h, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27g mol-1)

(a) 9.0 x 103

(b)  8.1 x 104 g

(c)  2.4 x 105 g

(d)  1.3 x 104 g