October 2021 1 14 Report
Определите степени окисления и валентности: 1)серы в:CaS,SO3,H2SO4,BaSO4 2)хлора в :HClO,HClO2,BaCl2,Cl2O7. 3)железа в:Fe2O3,Fe2S3,FeSO4,H2FeO4
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