\(n_{Cl_2\left(giảm\right)}=n_{Cl_2\left(p.ứ\right)}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ Đặt:n_{Mg}=a\left(mol\right);n_{Fe}=b\left(mol\right)\left(a,b>0\right)\\Mg+Cl_2\rightarrow\left(t^o\right)MgCl_2\\ 2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ \Rightarrow\left\{{}\begin{matrix}24a+56b=13,6\\a+1,5b=0,4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,2\end{matrix}\right.\\ m_{Mg}=24a=2,4\left(g\right);m_{Fe}=56b=11,2\left(g\right)\)