3 Cu0 + 4 HSVIIO4 3 CuIISVIO4 + SIVO2 + 2 H2O

This is an oxidation-reduction (redox) reaction:

3 Cu0 - 6 e- 3 CuII (oxidation)

3 SVII + 3 e- 3 SVI (reduction)

SVII + 3 e- SIV (reduction)

Change the oxidation states

Warning: Unknown compound 'HSO4'. Did you mean HsO4?