Gọi \(\left\{{}\begin{matrix}n_{Al}:x\left(mol\right)\\n_{Zn}:y\left(mol\right)\end{matrix}\right.\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(2Al+6H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Giải hệ PT:
\(\left\{{}\begin{matrix}27x+65y=31,4\\1,5x+y=0,7\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,2\\y=0,4\end{matrix}\right.\)
\(\left\{{}\begin{matrix}n_{Al2\left(SO4\right)3}=\frac{0,2}{2}=0,1\left(mol\right)\\n_{ZnSO4}=n_{Zn}=0,4\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Al2\left(SO4\right)3}=0,1.342=34,2\left(g\right)\\m_{ZnSO4}=0,4.161=64,4\left(g\right)\end{matrix}\right.\)
\(\Rightarrow n_{H2SO4}=n_{H2}=0,7\left(mol\right)\)
\(\Rightarrow CM_{H2SO4}=\frac{0,7}{0,2}=3,5M\)
