Помогите: Дополнить и уровнять электронным балансом. 1) СuSO4(р)+Na2Co3(р)+Н2O(ж)  =>
2) COCl2(р)+KCH3COO(Р)+H2O(ж) =>
3) Cr2(SO4)3(р)+(NH4)2S(р)+H2O(ж) =>
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