A$.$ A sample of aluminium $($Al$)$ metal was dissolved in hydrochloric acid $(HCl(aq)$ of hydrogen gas was collected over water at $21\mathrm{.}0C$ and $736mmHg.$ Calculate the mass $($in grams$)$ of the aluminium sample. $($Vapor pressure of water $=18\mathrm{.}6mmHg$ at $21\mathrm{.}0C.)$

$2Al(s)+6HCl(aq)2AlC{l}_3(aq)+3H_2(g)$