\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\)
\(m_{H_2}=0,15.2=0,3\left(g\right)\)
\(m_{dd}=m_{Fe}+m_{ddHCl}-m_{H_2}=8,4+250-0,3=258,1\left(g\right)\)
\(m_{FeCl_2}=0,15.127=19,05\left(g\right)\)
\(C\%_{FeCl_2}=\dfrac{19,05.100}{258,1}=7,38\%\)
`a)PTHH:`
`Fe + 2HCl -> FeCl_2 + H_2 \uparrow`
`0,15` `0,15` `0,15` `(mol)`
`n_[Fe]=[8,4]/56=0,15(mol)`
`b)V_[H_2]=0,15.22,4=3,36(l)`
`c)C%_[FeCl_2]=[0,15.127]/[8,4+250-0,15.2].100=7,38%`