\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ a,PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\\ n_{H_2}=\dfrac{3}{2}.0,2=0,3\left(mol\right)\\ b,m_{AlCl_3}=133,5.0,2=26,7\left(g\right)\\ c,V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ d,m_{ddsau}=5,4+120-0,3.2=124,8\left(g\right)\\ C\%_{ddAlCl_3}=\dfrac{26,7}{124,8}.100\approx21,394\%\)