\(2KMnO4+16HCl-->5Cl2+8H2O+2KCl+2MnCl2\)
\(2Al+3Cl2-->2AlCl3\)
\(n_{KMnO4}=\frac{18,96}{158}=0,12\left(mol\right)\)
\(n_{Cl2}=\frac{5}{2}n_{KMnO4}=0,3\left(mol\right)\)
\(n_{Al}=\frac{2}{3}n_{Cl2}=0,2\left(mol\right)\)
\(m_{Al}=0,2.27=5,4\left(g\right)\)
b) \(n_{Alcl3}=\frac{2}{3}n_{O2}=0,2\left(mol\right)\)
\(m_{AlCl3}=0,2.133,5=26,7\left(g\right)\)