Zn+2HCl---->ZnCl2 +H2
x--------------------x
Mg+2HCl------------>MgCl2+H2
y------------------------y
a) Theo bài ra ta có hệ pt
\(\)\(\left\{{}\begin{matrix}65x+24y=8,9\\136x+95y=23,1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
Theo pthh
n\(_{H2}=n_{Zn}+n_{Mg}=0,2\left(mol\right)\)
V\(_{H2}=0,2,22,4=4,48\left(l\right)\)
b) m\(_{Zn}=0,1.65=6,5\left(g\right)\)
m\(_{Mg}=0,1.24=2,4\left(g\right)\)
c)Theo pthh
n\(_{HCl}=2\left(n_{Mg}+n_{Zn}\right)=0,4\left(mol\right)_{ }\)
V\(_{HCl}=\frac{0,4}{1}=0,4\left(l\right)=400ml\)