$Al_2O_3$ is reduced by electrolysis at low potentials and high currents. If $4.0 \times 10^4$ amperes of current is passed through molten $Al_2O_3$ for $6$ hours,what mass of aluminium is produced? (Assume $100\%$ current efficiency,at. mass of $Al = 27 \ g \ mol^{-1}$).
- A$8.1 \times 10^4 \ g$
- B$2.4 \times 10^5 \ g$
- C$1.3 \times 10^4 \ g$
- D$9.0 \times 10^3 \ g$
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