a) PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b) Ta có: \(n_{HCl}=0,05\cdot0,3=0,015\left(mol\right)\)
\(\Rightarrow n_{Fe}=0,0075\left(mol\right)\) \(\Rightarrow m_{Fe}=0,0075\cdot56=0,42\left(g\right)\)
c+d) Theo PTHH: \(n_{FeCl_2}=n_{H_2}=n_{Fe}=0,0075\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,0075\cdot22,4=0,168\left(l\right)\\m_{FeCl_2}=0,0075\cdot127=0,9525\left(g\right)\end{matrix}\right.\)