Методом электронного баланса расставьте коэффициенты в уравнении реакции 1) KNO2+KI+H2SO4=I2+NO2+K2SO4+H2O
2)HI+H2SO4=I2+H2S+H2O
3)P+HNO3+H2O=H3PO4+NO​
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