\(a.n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ b.n_{FeCl_2}=n_{H_2}=n_{Fe}=0,1\left(mol\right)\\ m_{FeCl_2}=127.0,1=12,7\left(g\right)\\ c.V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.1.................0.1...........0.1\)
\(m_{FeCl_2}=0.1\cdot127=12.7\left(g\right)\)
\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)