[JoachimF]

Hi!

Consider the reaction N₂ + 2O₂  NO₂

Just seeing this equation, how would I know whether the entropy is increasing or not?

I was thinking that if it was a spontaneous reaction, then the entropy would be increasing. Though the creation of NO₂ requires energy, right?  In such a case entropy would be decreasing...?

I'm lost!

[Borek]

Number of molecules.

[JoachimF]

Embarrassed 

Thank you, Borek!