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Add the molar mass
After creating the classes we want to add a typical chemical property, like the molar mass. At first we define it as a property.
ex:hasMolarMass rdf:type rdfs:Property .
Every chemical compound can have an information about its molar mass.
ex:hasMolarMass rdfs:domain ex:ChemicalCompound .
The molar mass itself could be defined as an own datatype with some additional information. But for our small example we want to use a simple existing floating point datatype. So the Range of the ex:hasMolarMass property is