Gas thermodynamic functions

Metals. Kruglikh, et al. (104) measured saturated vapor pressures of erbium, samarium, and ytterbium by the Knudsen effusion method, and standard (average) sublimation entropies of 18.4, 20.7, and 25.6 cal./(gram atom °K.) were derived. Nesmeyanov, et al. (146) studied the vapor pressure of yttrium by an integral variant of the effusion technique. Similar studies at higher temperatures by Herrick (70) on samarium metal have been interpreted in good accord by both first and second law methods. Ideal gas thermodynamic functions have been derived from 100 °K. to 6000°K. at 100° intervals for both actinide and lanthanide elements by Feber and Herrick (45). 

R. C. Wilhoit, Ideal gas thermodynamic functions, TRC Current Data News 3, No. 2 (1975). 

L. Haar, A. S. Friedman, and C. W. Beckett, Ideal Gas Thermodynamic Functions and Isotope Exchange Functions for the Diatomic Hydrides, Deuterides and Tritides , National Bureau of Standards Monograph 20, 1961. 

R. C. Feber and C. C. Herrick, Ideal Gas Thermodynamic Functions of Lanthanide and Actinide Elements , Los Alamos Scientific Laboratory, University of California, Report LA-3184, 1964. 

We have adopted a vialue of AHS(CF2,g,298) = -44.6 kcal/mol from the data of Modica and LeGraff (16,17) and of Carlson (19). This yields values of the equilibrium constant for reaction t ) with in a factor of two of those calculated from the data of Farber et (21), which is certainly within the accuracy of both the experiment and the limits of the rigid-rotor, harmonic oscillator approximation at 2000 to 2500 K ( ). The physical and thermochemical data selected here are sumnarized in Table II and the ideal gas thermodynamic functions calculated to 1500 K from these data are summarized in Table III. 

These data are summarized in Table IV and used to calculate the ideal gas thermodynamic functions for trifiuoromethyl which are summarized in Table V. 

Most of these drawbacks were corrected by Stull, Westrum, and Sinke (1969). In a regular-size volume the authors have included the ideal gas thermodynamic functions of the API Project 44 as well as others that were not... 

Burcat, A., (1980). Ideal Gas Thermodynamic Functions of Hydrides and Deuterides, Part I, TAE Report No. 411, Technion, Haifa. 

Burcat A., Zeleznik, F.J. McBride, B. (1984). Ideal Gas Thermodynamic functions of phenyl, deuterophenyl and biphenyl radicals. NASA Rept to be published. 

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