a, \(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
\(n_{H2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(\Rightarrow n_{Fe2O3}=\frac{1}{3}n_{H2}=0,05\left(mol\right)\)
\(\Rightarrow m_{Fe2O3}=0,05.160=8\left(g\right)\)
b, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(\Rightarrow n_{AlCl3}=\frac{2}{3}n_{H2}=0,1\left(mol\right)\)
\(\Rightarrow m_{AlCl3}=0,1.133,5=13,35\left(g\right)\)