Складання електронного балансу окисно-відновних реакцій:
5.P2O5+C=>P+CO
6.FeCl2+H2S=>FeCl2+S+HCl
7.SO2+HNO3+H2O=>H2SO4+NO
8.CuO+NH3=>Cu+N2+H2O
9.HJ+H2SO4=>J2+H2S+H2O
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