<span> Ca(OH)2+2HNO3 = Ca(NO3)2 +2H2O;</span>
1) 2ZnS + 3O2 = 2ZnO + SO2
2)SO2 + 2H2S = 3S + 2H2O
3)Cu + S = CuS
4)CuS + 1,5O2 = CuO + SO2
0,12\%=м иода/40г *100\%