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juliomarquez8 juliomarquez8
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12 years ago
Cu + 4HNO3 = Cu(NO3)2 + 2 NO2 +2H2O
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wrote...
12 years ago
Cu = O

Cu in Cu(NO3)2  is +2

-------
N in HNO3 is +5

N in NO3- is +5

N in NO2 is +4
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