Розставте коефіцієнти методом електронного балансу: Cu+HNO3=Cu(NO3)2+No+H2O
Cr2O3+HNO3+KOH=K2CrO4+KNO2+H2O
Al+KMnO4+H2SO4=Al2(SO4)3+MnSO4+K2SO4+H2O4
FeS2+O2=Fe2O3+SO2
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