The Thermochemistry of the Chemical Substances [antikvár]

PREFACE The assembly of the table of values for the heats of formation in the section on Thermochemistry in the International Critical Tables was the first attempt ever made to collate all the published data involving heats of reaction and to prepare therefrom a self-consistent table of "best" values for the heats of formation of the chemical substances. The present book is a complete revision and extension of that original work, which was sponsored by the late Edward W. Washburn as Editor-in-Chief of the International Critical Tables and carried out by one of the present authors (F. R. B.) The assembly of a self-consistent table of values for the heats of formation of all the chemical substances requires (1) that all the original experimental data be recalculated with the use of appropriate auxiliary data, (2) that the value selected for the heat of formation of a given substance be as accurate as it is possible to obtain from the known data, and (3) that the selected "best" value be as consistent as possible with all the other values in the table and with all the known thermochemical data on reactions involving that substance. There are four main sections to the present book: (1), the introduction or explanatory part; (2), the table of heats of formation, which is the fruit of the work; (3), the text, in which the original published data are cited and discussed; and (4), the list of references to the literature, which includes references to all the published data bearing on thermochemistry. The introduction gives all the necessary information concerning the units, symbols, abbreviations, method of utilizing the table, etc. The table of values contains a list of all the chemical substances (except carbon compounds containing more than 2 carbon atoms), for which there are thermochemical data, together with values for the heats of formation (or heat of transition, fusion, or vaporization) of each substance. It was deemed expedient not to include in the present table values for the heats of formation of carbon compounds containing more than two carbon atoms. It should be possible to obtain from this table, by simple addition and subtraction, the heat of any process involving any of the substances given, with an accuracy as great as is actually known. There are listed in the table 5840 values of heats of formation, and, in addition, 350 values of heats of transition, fusion, vaporization, 'or reaction, for substances for which no values are given for the heat of formation. In the text, each paragraph or group of paragraphs is labeled with the formula of a chemical substance (or substances), and under that heading are cited all the published thermochemical data on reactions which can