Dobierz spółczynniki stechiometryczne:
1) _Cu + _HNO3 --> _Cu(NO3)2 + _NO2 + _H2O
2) _Cu + _HNO3 --> _Cu(NO3)2 + _NO +_H2O
3) _Cu + _H2SO4 --> _CuSO4 + _SO2 + _H2O
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