a)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(n_{H2}=\frac{15,68}{22,4}=0,7\left(mol\right)\)
Gọi a là số mol Mg b là số mol Fe
\(\left\{{}\begin{matrix}24a+56b=26,4\\a+b=0,7\end{matrix}\right.\)\(\rightarrow\left\{{}\begin{matrix}a=0,4\\b=0,3\end{matrix}\right.\)
\(n_{HCL}=0,7.2=0,14\left(mol\right)\)
\(\rightarrow V_{HCl}=\frac{1,4}{1}=1,4\left(l\right)=1400\left(ml\right)\)
b)
BTKl ta có
mhh+mHCl=m muối+mH2
\(\rightarrow m_{muoi}=76,1g\)