$2.$Explain the concept of excess molar volume and its relation to the activity coefficients and excess free energy in mixtures.

How do solvent$-$solute interactions influence the calculation of activity coefficients in binary mixtures?

What are the implications of non$-$ideal behavior on the thermodynamic properties of solutions, and how can this be quantified?

How do pressure and temperature influence the determination of Van Laar and Margules constants in high$-$pressure systems?