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Good morning to all, I read this forum for years, but only today I signed up, so I ask you to forgive me if my post had already been treated in other posts.

In my work I use Fluent v18.2 and I'm dealing with hypersonic aerodynamics.
On the net I found a lot of material, but some was satisfactory.
I present the problem.
Example:
Flight to Mach 10 at an altitude of 20 km.
Knowing the pressure and density that Species Mass Fraction values should I enter in order for the analysis to take into account the chemical reactions that occur at this flight regime?

Thank in Advance