Question

Why dinitrogen and dioxygen not react together to form oxides of nitrogen?

Answer 1

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For any chemical reaction to take place spontaneously, we look at a factor known as free energy available for that reaction. Gibb's Free Energy is given by the equation:

(delta)G=(delta)H−T(delta)S

This is one of the most important equations in all of chemistry because it provides information as to whether a particular reaction is spontaneously possible or not.

The quantity (delta)G must be negative for a reaction to take place spontaneously. The reaction discussed above is:

2N2+O2−−>2N2O

On calculating the values of change in enthalpy and temperature times change in entropy for the atmosphere, we see that this reaction can't take place.