помогите решить уравнения по химии!!!!Ca+S→Ca S; Na+S→Na2 S;Al+Cl2→Al Cl3;Li+O2→Li2O;Ca+N2→Ca3N2;H Cl→H C1+O2;Li+H2→Li O H+H2;Na2 O+H Br→Na Br+H2 O
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