July 2022 1 19 Report
Определите степени окисления атомов химических элементов по формулам: Na2O, CuO, H2S, H3RO4, MgS, NH3, Fe2O3, HNO3. Al2O3, H3P, SO2, KOH, Cl2O7, NO2, H2CO3.
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