1) When nitrogen interacts with hydrogen, ammonia is released:
N2 + 3H2 → 2NH3;
2) When ammonia interacts with oxygen, nitrogen (II) oxide and water are formed:
4NH3 + 5O2 → 4NO + 6H2O;
3) Nitrogen (II) oxide is oxidized to nitrogen (IV) oxide:
2NO + O2 → 2NO2;
4) Nitrogen (IV) oxide reacts with oxygen and water to produce concentrated nitric acid:
4NO2 + O2 + 2H2O (horizontal) → 4HNO3 (conc.).
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