3Cu2S + 22HNO3 = 6Cu(NO3)2 + 10NO + 3H2SO4 + 8H2O
2Cu(+1)-2e=2Cu(+2)|3
N(+5)+3e=N(+2) | 10
S(-2)-8e=S(+6) |3
3Cu2S + 22HNO3 = 6Cu(NO3)2 + 10NO + 3H2SO4 + 8H2O
2Cu(+1)-2e=2Cu(+2)|3
N(+5)+3e=N(+2) | 10
S(-2)-8e=S(+6) |3