\(Mg+2HCl\rightarrow MgCl_2+H_2\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Mg}=x;n_{Fe}=y\\ \Rightarrow hpt:\left\{{}\begin{matrix}24x+56y=4,08\\\frac{x}{y}=\frac{1}{2}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,03\\y=0,06\end{matrix}\right.\\ V_{H_2}=22,4.\left(x+y\right)=2,016\left(l\right)\)
Đặt :
nMg = x mol
nFe = 2x mol
<=> 24x + 112x = 4.08
=> x = 0.03
Mg + 2HCl --> MgCl2 + H2
Fe + 2HCl --> FeCl2 + H2
VH2 = ( 0.03+0.06)*22.4 = 2.016 (l)