напишите уравнения реакций и подберите коэффициенты электронным методом Fe3P2+HNO3→Fe(NO3)3+H3PO4+NO+ ... Na3AsO3+K2Cr2O7+H2SO4→NaCrO4+NaI+H2SO4→ Cr2(SO4)3+I2+....
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