Reactions in Liquid or Solid Mixtures

The factor exp. .. is usually close to unity and is usually omitted. 

In spite of many measurements of the activity coefficients fu of substances in binary, and to a lesser extent in multi-component, mixtures (a 

It is true that we can determine X for such a reaction with high accuracy from calorimetric values of and A5 according to equation (15), but we are usually then little better off because we are unable to reverse the calculation by using equation (114) to calculate accurate values of yields. From a severely chemical point of view this is the main reason for the considerable effort currently being devoted to theory and measurements in the field of liquid mixtures. 

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