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# The oxidation of ammonia in excess air produces

### Question

The oxidation of ammonia in excess air produces

A) NO

B) N2O

C) NO2

D) N2O4

### Explanation:

Ammonia is converted to nitric acid in 2 stages. It is oxidized by heating with oxygen in the presence of a catalyst such as platinum with 10% rhodium, to form nitric oxide/nitrogen(ii)oxide and water/steam. This reaction is strongly exothermic, making it a useful heat source once initiated:
4NH$$_3$$(g) + 5O$$_2$$(g) $$\rightarrow$$ 4NO(g) + 6H$$_2$$O(g) (ΔH = −905.2kJ/mol)

Explanation provided by Ella

## Dicussion (1)

• Ammonia is converted to nitric acid in 2 stages. It is oxidized by heating with oxygen in the presence of a catalyst such as platinum with 10% rhodium, to form nitric oxide/nitrogen(ii)oxide and water/steam. This reaction is strongly exothermic, making it a useful heat source once initiated:
4NH$$_3$$(g) + 5O$$_2$$(g) $$\rightarrow$$ 4NO(g) + 6H$$_2$$O(g) (ΔH = −905.2kJ/mol)