July 2021 1 38 Report
7класс
Определить валентность :
HN3 , PO4 , SO4 , SH2 , Al2O3 ,
Определить относительная масса вещества :
H2S , 2H3PO4 , HF2 , 4P2O5 .
Пожалуйста, прошу❤
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