$Al_2O_3$ is reduced by electrolysis at low potential and high current. If a current of $4 \times 10^4 \ A$ is passed through molten $Al_2O_3$ for $6 \ h$,how many grams of $Al$ will be produced? (Assume $100\%$ current efficiency and atomic mass of $Al = 27 \ g \ mol^{-1}$)
- A$2.42 \times 10^5 \ g$
- B$1.3 \times 10^4 \ g$
- C$9 \times 10^3 \ g$
- D$8.1 \times 10^4 \ g$
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