For a regular solution model what is the excess molar free enrgy dependent upon?

For a regular solution model what is the excess molar free enrgy dependent upon? Correct Answer Molecular size and intermolecular forces

For a regular solution model what is the excess molar free energy dependent upon the Molecular size and intermolecular forces, the former expressed in terms of liquid molar volume and the later expressed in terms of enthalpy of vaporization.
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Only if the calculated molar mass is higher than the actual molar mass of the solute, the calculated molar mass is considered to be abnormal molar mass.
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