Often, a completely different substance is produced from one substance in chemistry.
This is done for many reasons. The inaccessibility of a pure substance, a number of specific properties of the resulting substance, and so on.
Before starting the development of a new substance, chemists first write an equation in order to understand what will happen and what will happen.
In our case, there are several equations.
4NO2 + O2 + 2H2O = 4HNO3 is one of the options.
2NO + O2 = 2NO2 is also a very interesting equation.
4NH3 + 5O2 = 4NO + 6H2O
In the latter, the catalyst is expressed as Pt.
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