Question

сделать ОВР : Cu2S + H2SO4 -> CuSO4 + S + H2O

Answer 1

3 Cu2S + 8 H2SO4 = 6 CuSO4 + 5 S + 8 H2O

S(-2)-2e=S(0) |3

S(-6)+6e=S(0)  |1