Contents Single Point Energy Calculations

We have two terms, AT x S and T x AS. We have to think a little bit about these two terms and use common sense (and a Httle bit of knowledge). The AT term is easy - the difference between two temperatures, Tj = 314.4 K and Ti = 309.8 K. But what is S It is the entropy content at temperature T, that is, a single-point value for the entropy function. Previously, on several occasions I said that in general you cannot know the entropy content (or the enthalpy content or the Gibbs energy content) at a single point only a difference between two points can be determined. And true to this statement most current physical chemistry textbooks will tell you that S is not defined, therefore G is not defined and you cannot calculate it this way. But physical chemists should know better read the following short note. 

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