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  2. Enthalpy of mixing - Wikipedia

    en.wikipedia.org/wiki/Enthalpy_of_mixing

    In thermodynamics, the enthalpy of mixing (also heat of mixing and excess enthalpy) is the enthalpy liberated or absorbed from a substance upon mixing. [1] When a substance or compound is combined with any other substance or compound, the enthalpy of mixing is the consequence of the new interactions between the two substances or compounds. [1]

  3. Excess property - Wikipedia

    en.wikipedia.org/wiki/Excess_property

    The pure component's molar volume and molar enthalpy are equal to the corresponding partial molar quantities because there is no volume or internal energy change on mixing for an ideal solution. The molar volume of a mixture can be found from the sum of the excess volumes of the components of a mixture:

  4. Flory–Huggins solution theory - Wikipedia

    en.wikipedia.org/wiki/Flory–Huggins_solution...

    Flory–Huggins solution theory is a lattice model of the thermodynamics of polymer solutions which takes account of the great dissimilarity in molecular sizes in adapting the usual expression for the entropy of mixing. The result is an equation for the Gibbs free energy change for mixing a polymer with a solvent. Although it makes simplifying ...

  5. Ideal solution - Wikipedia

    en.wikipedia.org/wiki/Ideal_solution

    The enthalpy of mixing is zero [2] as is the volume change on mixing by definition; the closer to zero the enthalpy of mixing is, the more "ideal" the behavior of the solution becomes. The vapor pressures of the solvent and solute obey Raoult's law and Henry's law , respectively, [ 3 ] and the activity coefficient (which measures deviation from ...

  6. Van Laar equation - Wikipedia

    en.wikipedia.org/wiki/Van_Laar_equation

    The Van Laar equation is a thermodynamic activity model, which was developed by Johannes van Laar in 1910-1913, to describe phase equilibria of liquid mixtures. The equation was derived from the Van der Waals equation.

  7. Entropy of mixing - Wikipedia

    en.wikipedia.org/wiki/Entropy_of_mixing

    This quantity combines two physical effects—the enthalpy of mixing, which is a measure of the energy change, and the entropy of mixing considered here. For an ideal gas mixture or an ideal solution , there is no enthalpy of mixing ( Δ H mix {\displaystyle \Delta H_{\text{mix}}\,} ), so that the Gibbs free energy of mixing is given by the ...

  8. Enthalpy change of solution - Wikipedia

    en.wikipedia.org/wiki/Enthalpy_change_of_solution

    An ideal solution has a null enthalpy of mixing. For a non-ideal solution, it is an excess molar quantity. Energetics. Dissolution by most gases is exothermic. That ...

  9. Regular solution - Wikipedia

    en.wikipedia.org/wiki/Regular_solution

    In contrast to ideal solutions, regular solutions do possess a non-zero enthalpy of mixing, due to the W term. If the unlike interactions are more unfavorable than the like ones, we get competition between an entropy of mixing term that produces a minimum in the Gibbs free energy at x 1 = 0.5 and the enthalpy term that has a maximum there.