\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH :
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05 0,1 0,05 0,05
\(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
\(V_{HCl}=\dfrac{n}{C_M}=\dfrac{0,1}{1}=0,1\left(l\right)\)
\(m_{FeCl_2}=0,05.127=6,35\left(g\right)\)