@property<EOL><INDENT>def rhogm(self):<DEDENT>
Vmg = self.Vmg<EOL>if Vmg:<EOL><INDENT>return <NUM_LIT:1.>/Vmg<EOL><DEDENT>return None<EOL>
r'''Molar density of the mixture in the gas phase at the
        current temperature, pressure, and composition in units of [mol/m^3].

        Utilizes the object oriented interface and
        :obj:`thermo.volume.VolumeGasMixture` to perform the actual
        calculation of molar volume.

        Examples
        --------
        >>> Mixture(['water'], ws=[1], T=500).rhogm
        24.467426039789093