\(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{8,4}{56}=0,15mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,15 0,3 0,15 0,15 ( mol )
\(V_{H_2}=n_{H_2}.22,4=0,15.22,4=3,36l\)
\(m_{HCl}=n_{HCl}.M_{HCl}=0,3.36,5=10,95g\)
\(m_{FeCl_2}=n_{FeCl_2}.M_{FeCl_2}=0,15.127=19,05g\)