a,
\(m_{HCl}=18,25\left(g\right)\)
\(\rightarrow n_{HCl}=0,5\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(\rightarrow n_{Fe}=n_{FeCl2}=n_{H2}=0,25\left(mol\right)\)
\(\rightarrow m=14\left(g\right)\)
\(\rightarrow V=5,6\left(l\right)\)
b,
\(m_{dd_{spu}}=14+182,5-0,25.2=196\left(g\right)\)
c,
\(m_{FeCl2}=31,75\left(g\right)\)
\(\rightarrow C\%_{FeCl_2}=\frac{31,75.100}{196}=16,2\%\)