Hi! I would like to suggest
 

Hi!

I would like to suggest defining the molecular weight (specie::W()) as a "dimensionedScalar" with "dimensionSet" = (1 0 0 0 -1 0 0);
It will help to avoid dimension problems. It would be useful when working with "CombustionMixture ::multicomponentMixture".

..but it's only a suggestion.