Al_2 O_3 is reduced by electrolysis at low potentials and high currents. If 4.0 × 10^4 amperes of current is passed through molten Al_2 O_3 for 6…

$\displaystyle \mathrm{Al}_2 \mathrm{O}_3$ is reduced by electrolysis at low potentials and high currents. If $\displaystyle 4.0 \times 10^4$ amperes of current is passed through molten $\displaystyle \mathrm{Al}_2 \mathrm{O}_3$ for $\displaystyle 6$ hours, what mass of aluminium is produced ? (Assume $\displaystyle 100$% current efficiency, At. mass of $\displaystyle \mathrm{Al}=27 \mathrm{~g} \mathrm{~mol}^{-1}$ )