5 Fe0 + 2 KMnVIIO4 + 16 HCl 2 MnIICl2 + 5 FeIICl2 + 2 KCl + 8 H2O

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- 2 MnII (reduction)

5 Fe0 - 10 e- 5 FeII (oxidation)

Change the oxidation states