\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\
pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,3
\(m_{Al}=0,2.27=5,4\left(g\right)\\
pthh:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,1 0,3
\(m_{Fe_2O_3}=160.0,1=16\left(g\right)\)
\(a,n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH:
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,2<---------------------------0,3
\(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2O\)
0,1<------0,3
\(\left\{{}\begin{matrix}b,m_{Al}=0,2.27=5,4\left(g\right)\\c,m_{Fe_2O_3}=0,1.160=16\left(g\right)\end{matrix}\right.\)