\(a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\)
\(n_{Fe}=\frac{m_{Fe}}{M_{Fe}}=\frac{1,4}{56}=0,025\left(mol\right)\)
\(\Rightarrow n_{HCl}=0,05\left(mol\right)\)
\(m_{HCl}=M.n=0,05.36,5=1,825\left(g\right)\)
\(b,n_{H_2}=n_{Fe}=0,025\)
\(\Rightarrow V_{H_2}=n.22,4=0,025.22,4=0,56\left(l\right)\)