Dilute Species Model, inputting species as ppm or percentages

Hi,

I'm working on a deactavation model for a DOC catalyst in Comsol 5.3a. The data I have been able to source form literature is all in ppm or percenatges, and Comsol will only allow inputs in mol/m^3. I have found release statements for 5.2a that state values in ppm or percentages are compatable.

I am trying to inputs these values into the inital conditions and in-flow of the dillute species model. This is working with a chemical reaction and PDE model, but this wont affect my above problem.

Any help on this matter would be appreciated!