\(n_{Al}=\dfrac{3}{27}=\dfrac{1}{9}\left(mol\right)\)
\(n_{HCl}=\dfrac{7.3}{36.5}=0.2\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(TC:\)
\(\dfrac{\dfrac{1}{9}}{2}>\dfrac{0.2}{6}\Rightarrow Aldư\)
\(n_{AlCl_3}=\dfrac{0.2\cdot2}{6}=\dfrac{1}{15}\left(mol\right)\)
\(m=\dfrac{1}{15}\cdot133.5=8.9\left(g\right)\)