Convexity in the Theory of Lattice Gases by Robert B. Israel

By Robert B. Israel

Arthur S. Wightman (introduction)

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What is the maximum amount of work that can be obtained from hydrolyzing I mole of ATP to ADP and phosphateat 298 K? 5 kJ/mol. If the conversionof free energy to mechanical work is 1007oefficient, how many moles of ATP would have to be hydrolyzedto lift a 100 kg weight I meter high? ,Appendix 1). ,Appendix 2). Furthermore, pH 7 is usually selectedas the standardcondition, so that the activity of the hydrogen ion is set equal to 1 at pH 7, and the standardfree energy of formation of the hydrogen ion is set equal to zero at pH 7.

At. and the change, give entropy same paths the reversible all However, path. versible out iris carried in state change if actual even the is correct calculated entropy change of some consideration confusing, be somewhat reversibly. Although this appearsto concept. examples will help in understandingthis The secondlaw also includes important considerationsabout entropy: For a reversible changein state,the entropy of the universe is constant,whereasfor an irreversible change in state,the entropy of the universe increases.

5 MOLECULAR INTERPRETATION OF ENTROPY We will now consider a few examples of absolute entropies and entropy changesfor chemical reactions, and how they might be interpreted in molecular terms. The molecular interpretationof thesenumbers is straightforward, namely, that solid is more ordered than liquid, which is more ordered than gas; therefore, the solid has the lowest entropy and the gas the highest. Standardentropy changesfor some chemical reactions are given in Table 2-1. As expected,the entropy changeis negative for the first two reactions in the gas phaseas the number of moles of reactantsis greater than the number of moles of products.

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