September 2021 0 7 Report
Составьте реакции и поставьте коэффициенты: 1) Si + .... = SiO2
2) SiO2 + .... = Na2SiO3
3) Na2SiO3 + ..... = H2SiO3
4) H2SiO3 + ,... = SiO2
5) SiO2 + .... = Si 
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