Составьте уравнения реакций, указав условия их проведения.Определите вещества Х иУ: H2S→X→SO3→У→ВаSO4: а) S , H2SO4; в) H2SO3 ,H2SO4; с)FeS ,BaSO3; д)SO2 ,H2SO4; е) SO2 , S
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