\(n_{Mg\left(OH\right)_2}=\dfrac{23,2}{58}=0,4mol\)
Mg(OH)2+2HCl\(\rightarrow\)MgCl2+2H2O
\(n_{HCl}=2n_{Mg\left(OH\right)_2}=0,8mol\)
\(C\%_{HCl}=\dfrac{0,8.36,5.100}{73}=40\%\)
Mg(OH)2+H2SO4\(\rightarrow\)MgSO4+2H2O
\(n_{H_2SO_4}=n_{Mg\left(OH\right)_2}=0,4mol\)
\(V_{H_2SO_4}=\dfrac{0,4}{2}=0,2l\)