a) - Phần a:
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: Fe + 2HCl ---> FeCl2 + H2
0,2<-------------------------0,2
- Phần b:
\(n_{Fe}=\dfrac{33,6}{56}=0,6\left(mol\right)\\ n_{Fe\left(Fe_2O_3\right)}=0,6-0,2=0,4\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,2<--------------------0,4
=> \(\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,2.56}{0,2.\left(56+160\right)}.100\%=26\%\\\%m_{Fe_2O_3}=100\%-26\%=74\%\end{matrix}\right.\)