\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: M + 2HCl ---> MCl2 + H2
0,2<--0,4<---------------0,2
=> \(\left\{{}\begin{matrix}M_M=\dfrac{4,8}{0,2}=24\left(g/mol\right)\left(Magie\right)\\C_{M\left(HCl\right)}=\dfrac{0,4}{0,1}=4M\end{matrix}\right.\)