Answer
Please see the work below.
Work Step by Step
We know that
$20.4g\space Al\times \frac{1mol\space Al}{26.98g\space Al}\times \frac{3mol\space I_2}{2mol\space Al}\times \frac{253.8g\space I_2}{1mol\space I_2}=288g\space I_2$
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