Розставити коефіцієнти методом електронного балансу.
KMnO4 + HNO2 + H2SO4 (стрелка) MnSO4 + HNO3 + K2SO 4 + H2O
Fe + O2 = Fe2O3
CO2 + H2O = C6H12O6 + O2
Cr 2O3 + NaNO 3 + NaOH = Na2CrO 4 + NaNO2 + H2O.
WO3 + H2О = W + H2O
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