PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2}=0,1\left(mol\right)\\n_{HCl\left(ban.đầu\right)}=0,1\cdot2\cdot130\%=0,26\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\\V_{ddHCl}=\dfrac{0,26}{0,8}=0,325\left(l\right)=325\left(ml\right)\end{matrix}\right.\)