3 CuFeIIS2-II + 38 HNVO3 3 FeXVIII(O3)3 + 3 Cu(NVO3)2 + 32 NIIO + 6 H2SVIO4 + 13 H2O

This is an oxidation-reduction (redox) reaction:

6 S-II - 48 e- 6 SVI (oxidation)

32 NV + 96 e- 32 NII (reduction)

3 FeII - 48 e- 3 FeXVIII (oxidation)

Change the oxidation states