Ammonia/oxygen reaction stoichiometry

Oct 2019
1
0
USA
2NH4 +3O2 >> 2NO2 +4H +2H2O
- 3.43g O2/g to convert

2NO2 + O2 >> 2NO3
- 1.14g O2/g NO2 oxidized

Total oxidation reaction:
NH4 + 2O2 >> NO3 +2H -H2O
- 4.57g O2/g N oxidized


Can someone please explain how the gram of O2 per gram of ammonia/nitrite is calculated? Thanks!
 
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