Расставьте коэффициенты в уравнениях методом электронного баланса.
а)FeS2+HNO3(конец.)-Fe(NO3)3+H2SO4+NO2верх+H2O
б) H2O2+KMnO4+H2SO4-O2верх+K2SO4+MnSO4+H2O
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