№1
Fe2O3+6 HNO3 = 2Fe(NO3)3+3 H2O
№2
4 HNO3 = 2 H2O+4 NO2↓+O2↑
№3
2 NaOH+Cu(NO3)2 = Cu(OH)2↓+2 NaNO3
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Answers & Comments
№1
Fe2O3+6 HNO3 = 2Fe(NO3)3+3 H2O
№2
4 HNO3 = 2 H2O+4 NO2↓+O2↑
№3
2 NaOH+Cu(NO3)2 = Cu(OH)2↓+2 NaNO3