dobierz współczynniki:
1) H2S + HNO3 ---> H2SO4 + NO + H2O
2) HNO3 + HI --> NO2 + HIO3 + H2O
3) Mg + HNO3 --> Mg(NO3)2 + N2O + H2O
4) P + HNO3 + H2O --> H3PO4 + NO
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