3 Cu2IS-II + 22 HNVO3 6 CuII(NVO3)2 + 3 H2SVIO4 + 10 NIIO + 8 H2O

This is an oxidation-reduction (redox) reaction:

6 CuI - 6 e- 6 CuII (oxidation)

3 S-II - 24 e- 3 SVI (oxidation)

10 NV + 30 e- 10 NII (reduction)

Change the oxidation states