Simpler Chemical Reaction Problem

Sam

I have the following problem. Main gas stream is Air with a 30 PPM (parts per million by volume) of SO3 at the inlet. I'm injection NH3 downstream of the inlet. The chemical reaction is NH3 + SO3 + H2O --> NH4HSO4.

The reaction is temperature dependent but instantaneous. I don't know the reaction constants. Is there are way to combine the intesections of the scalars of SO3 and NH3 and H2O to form a new scale of NH4HSO4? Or, how do I model this chemical reaction. I'm new to this.

Thanks for the help.

Sam