2 Fe2S3-II + 3 O20 + 6 H2O-II 4 Fe(O-IIH)3 + 6 S0

This is an oxidation-reduction (redox) reaction:

6 S-II - 12 e- 6 S0 (oxidation)

6 O0 + 12 e- 6 O-II (reduction)

Change the oxidation states