Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 1
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CONTRIBUTIONS TO THE DATA ON THEORETICAL
XI. Entropies of Inorganic Substances. Revision (1948) of Data and
Methods of Calculation'
By K. K. KELLEY 2
The first bulletin (269)3 in this series, which appeared in 1932,
compiled the entropy values then available for the elements and in-
organic compounds, results being listed for some 150 substances.
Elaborations and revisions followed in 1936 (272) and 1941 (280),
when over 500 usable entropy values were tabulated. The present
bulletin constitutes a further elaboration and revision. The accumu-
lation of data since 1940 has been marked, and 800 entropy values
now are available.
The present bulletin also contains all the pertinent explanatory
matter that appeared in its predecessors. Thus, it retains the same
dual purpose of assembling the available values of the entropies at
298.160 K. of the elements and inorganic compounds and giving enough
explanation of methods of calculating entropies to make the results
VALUE OF ENTROPY DATA
In the study of chemical and metallurgical reactions the two factors
of predominant importance are the free energy of reaction and the
rate of reaction. Although entropy data sometimes are of value in
the study of reaction rates-a subject best treated by the methods of
statistical mechanics-this matter will not be discussed here. By far
the greatest value of entropy data is their usage in the derivation of
reaction free energies. Knowlege of the free energy of reaction is
adequate for determining whether or not the reaction will occur and,
if it will, to what extent it will proceed under the conditions that may
be imposed by practical considerations. Metallurgists have been
slower than chemists in adopting thermodynamic methods of study,
possibly because the labor involved in obtaining adequate free-energy
data usually is irksome and sometimes may appear to be an indirect
approach to the problem at hand. However, failure to consider
1 Work on manuscript completed November 1948.
2 Supervising engineer, Pacific Experiment Station, Bureau of Mines.
3 Italicized numbers in parentheses refer to citations in the bibliography at the endlof this bulletin; page
numbers refer to the citation and not to this bulletin.
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Kelley, K. K. Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation, report, 1950; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12637/m1/5/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.