\(n_{HCl}=\dfrac{146\cdot10\%}{36.5}=0.4\left(mol\right)\)
\(M\left(OH\right)_2+2HCl\rightarrow MCl_2+2H_2O\)
\(0.2...............0.4\)
\(M_{M\left(OH\right)_2}=\dfrac{11.6}{0.2}=58\left(\dfrac{g}{mol}\right)\)
\(\Rightarrow M+34=58\)
\(\Rightarrow M=24\)
\(M:Mg\left(Magie\right)\)