розтавити коефіцієнти в схумах реакції
AI+S--->AI2S3;
HgO-->Hg+O2;
Zi +O2--> Zi2O;
Cr(OH) 3--> Cr2O3+H2O ;
H2S+O2--> SO2+ H2O ;
Na+N2O--> Na2OH+ H2​
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