Em tham khảo nha :
\(\begin{array}{l}
2)\\
a)\\
F{e_3}{O_4} + 4{H_2} \to 3Fe + 4{H_2}O\\
{n_{{H_2}}} = \dfrac{{10,08}}{{22,4}} = 0,45mol\\
{n_{Fe}} = \dfrac{3}{4}{n_{{H_2}}} = 0,3375mol\\
{m_{Fe}} = 0,3375 \times 56 = 18,9g\\
b)\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
{n_{HCl}} = \dfrac{{10,95}}{{36,5}} = 0,3mol\\
\dfrac{{0,3375}}{1} > \dfrac{{0,3}}{2} \Rightarrow Fe\text{ dư}\\
{n_{F{e_d}}} = 0,3375 - \dfrac{{0,3}}{2} = 0,1875mol\\
{m_{F{e_d}}} = 0,1875 \times 56 = 10,5g\\
{n_{FeC{l_2}}} = \dfrac{{{n_{HCl}}}}{2} = 0,15mol\\
{m_{FeC{l_2}}} = 0,15 \times 127 = 19,05\\
3)\\
a)\\
2Al + 6HCl \to 2AlC{l_3} + 3{H_2}\\
{n_{Al}} = \dfrac{{4,05}}{{27}} = 0,15mol\\
{n_{{H_2}}} = \dfrac{3}{2}{n_{Al}} = 0,225mol\\
{V_{{H_2}}} = 0,225 \times 22,4 = 5,04l\\
b)\\
F{e_3}{O_4} + 4{H_2} \to 3Fe + 4{H_2}O\\
{n_{F{e_3}{O_4}}} = \dfrac{{23,2}}{{232}} = 0,1mol\\
\dfrac{{0,1}}{1} > \dfrac{{0,225}}{4} \Rightarrow F{e_3}{O_4}\text{ dư}\\
{n_{F{e_3}{O_4}d}} = 0,1 - \dfrac{{0,225}}{4} = 0,04375mol\\
{m_{F{e_3}{O_4}d}} = 0,04375 \times 232 = 10,15g\\
{n_{Fe}} = \dfrac{3}{4}{n_{{H_2}}} = 0,16875mol\\
{m_{Fe}} = 0,16875 \times 56 = 9,45g
\end{array}\)
