\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2.......0.4........0.2.......0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(V_{dd_{HCl}}=\dfrac{0.4}{0.2}=2\left(l\right)\)
\(C_{M_{FeCl_2}}=\dfrac{0.2}{2}=0.1\left(M\right)\)
a)
$Fe + 2HCl \to FeCl_2 + H_2$
$n_{H_2} = n_{Fe} = \dfrac{11,2}{56} = 0,2(mol)$
$V_{H_2} = 0,2.22,4 = 4,48(lít)$
b)
$n_{HCl} = 2n_{Fe} = 0,4(mol)$
$V_{dd\ HCl} = \dfrac{0,4}{0,2} = 2(lít) = 2000(ml)$
c)
$n_{FeCl_2} = n_{Fe} = 0,2(mol)$
$\Rightarrow C_{M_{FeCl_2}} = \dfrac{0,2}{2} = 0,1M$