see if there are any changes in electrovalency.
as such, Fe + 2H+ + 2Cl- --> Fe2+ + 2Cl- + H2
in FeCl2, the electrovalency of Fe is 2 because in any compound that does not have a charge, ie. 0, the charges on the elements in it must cancel out.
so, in order to balance the double negative charge on 2 chloride ions, the iron must possess a postive of charge of +2.