MOLARMASS
The MolarMass function returns the molar mass (commonly called the molecular weight) of the specified substance, as in the following example.
MW=MolarMass(CarbonDioxide)
Note that this function is not implemented for substance AirH2O and the brine fluids. It may also not be available for some incompressible substances.
For brines, see: MolarMass_Soln