Câu 1:
a) PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\) (1)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\) (2)
b) Đặt \(\left\{{}\begin{matrix}n_{Mg}=a\left(mol\right)=n_{MgCl_2}\\n_{Al}=b\left(mol\right)=n_{AlCl_3}\end{matrix}\right.\)
Ta lập được hệ phương trình:
\(\left\{{}\begin{matrix}24a+27b=5,1\\95a+133,5b=22,85\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,1\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}n_{HCl\left(1\right)}=0,2\left(mol\right)\\n_{HCl\left(2\right)}=0,3\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{HCl}=0,5\left(mol\right)\) \(\Rightarrow C_{M_{HCl}}=\dfrac{0,5}{0,25}=2\left(M\right)\)
