Восстановите пропуски в уравнениях реакций:
1)4P+........→2P2O3
2)2H2S+........→2H2O+2SO2
3)C3H2+5O2→4......+2H2O
4).......+3O2→CO2+2SO2
5)4......+13O2→4CuO+Fe2O3+SO2
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