РОЗСТАВТЕ КОЕФІЦІЄНКИ У РІВНЯННЯХ ХІМІЧНИХ РЕАКЦІЙ; Na₂O + H₂O = NaOH; Ng+H,= NHại KCIO3 = KCI + O₂; Al₂O3 + Fe = Fe₂O3 + Al; Pb(NO3)2 = PbO + NO₂ + O₂; SIO₂ + HF = SiF4 + H₂O.
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