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4 NH3 + 5 O2 --> 4 NO + 6 H2O

2 NO + O2--> 2 NO2(g)

3 NO2 + H2O --> 2 HNO3 + NO

4 HNO3 --> 4 NO2(g) + 2 H2O + O2(g)

Au + 4 HCl + HNO3 --> HAuCl4 + NO + 2 H2O

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