Gọi \(\left\{{}\begin{matrix}n_{Mg}=a\left(mol\right)\\n_{Zn}=b\left(mol\right)\end{matrix}\right.\)
PTHH:
Mg + H2SO4 ---> MgSO4 + H2
a---------------------------------->a
Zn + H2SO4 ---> ZnSO4 + H2
b---------------------------------->b
\(\Rightarrow\left\{{}\begin{matrix}24a+65b=8,9\\a+b=\dfrac{4,48}{22,4}=0,2\end{matrix}\right.\Leftrightarrow a=b=0,1\left(mol\right)\\ \rightarrow\left\{{}\begin{matrix}m_{Mg}=0,1.24=2,4\left(g\right)\\m_{Zn}=0,1.65=6,5\left(g\right)\end{matrix}\right.\)