\(PTHH:2Mg+2HCl\rightarrow MgCl_2+H_2\)
_________a_______ 2a _____a _______a
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b ____3b______ b_________1,5b
\(n_{HCl}=0,5.1=0,5\left(mol\right)\)
\(n_{H2}=\frac{4,368}{22,4}=0,195\left(mol\right)\Rightarrow a+1,5b=0,195\)
\(m_{hh}=3,87\left(g\right)\Rightarrow24a+27b=3,87\)
\(\Rightarrow\left\{{}\begin{matrix}a=0,06\\b=0,09\end{matrix}\right.\)
\(\%m_{Mg}=\frac{24.0,06}{3,87}.100\%=37,21\%\)
\(\%m_{Al}=\frac{27.0,09}{3,87}.100\%=62,79\%\)