\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05------------>0,05--->0,05
=> \(\left\{{}\begin{matrix}m_{FeCl_2}=0,05.127=6,35\left(g\right)\\m_{H_2}=0,05.2=0,1\left(g\right)\end{matrix}\right.\)
`n_{Fe} = (2,8)/(56)=0,05(mol)`
PTHH:`Fe+2HCl->FeCl_2+H_2`
`n_{FeCl_2}=n_{H_2}=n_{Fe}=0,05(mol)`
`=>m_{FeCl_2}=0,05.127=6,35(g);m_{H_2}=0,05.2=0,1(g)`