ПОМОГИТЕ ПОЖАЛУЙСТА!!! УМОЛЯЮ!!!
НУЖНО ПРИРАВНЯТЬ РЕАКЦИИ:
1) K2O+H2O=
2) K2O+HBr=
3) K2O+HNO3=
4) KOH+ZnSO4=
5) K2SO3+BaCl=
6)K2O+H2SO4=
7)KOH+SO3=
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