104. Solving a chemistry problem
168. Arrange the coefficients in the reaction equations using the ion-electron balance method. Justify the direction of one of the reactions, using the calculation of the EMF:
168. FeHNO3 = Fe(NO3)3 NO2 H2O;
KMnO4 Na2SO3 H2O = MnO2 Na2SO4 CON.
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