Apparent molar enthalpy , defined

We cannot obtain values for H since we cannot obtain absolute values for H or H. To overcome this problem, we define a quantity d>L, which we call the relative apparent molar enthalpy, by the equation... 

Also tabulated is 4>L, the apparent partial molar enthalpy. We will define this quantity and describe its application later. 

Gibbs functions for a real salt solution and the corresponding ideal salt solution containing m2 moles of salt in a kilogram of solvent. GE can be calculated for many aqueous salt solutions from published values of 0 and y . In the same way, the corresponding excess enthalpy HE can be defined and this equals the apparent partial molar enthalpy. Thus the properties of salt solutions can be examined in plots of GE, HE, and T SE against m2, where SE is the... 

The first thing we come across when looking at real data is that quite often the data are reported as apparent molar volumes, enthalpies, entropies or heat capacities. If we call component 1 the solvent (usually water in our cases), component 2 the solute (say, NaCl), Z and Z the total and molar forms of any of these properties, then apparent molar properties are defined as... 

The following development is in terms of enthalpy, but the same can be done for free energy, entropy, partial molar volume and so on. The reaction energetics are defined by Figure 3.2, where it should be apparent that... 

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