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The Dissociation Energy of Carbon Monoxide and the Heat of Sublimation of Graphite

Pauling, Linus and Sheehan, William F., Jr. (1949) The Dissociation Energy of Carbon Monoxide and the Heat of Sublimation of Graphite. Proceedings of the National Academy of Sciences of the United States of America, 35 (7). pp. 359-363. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas49c

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Abstract

For a number of years there has existed doubt about the value of the dissociation energy of carbon monoxide and about the heat of sublimation of graphite, a directly related quantity. The most popular values for the dissociation energy of carbon monoxide are 9.144 electron-volts, suggested by Herzberg [1] on the basis of predissociation phenomena in band spectra, 9.61 e. v., suggested by Hagstrum and Tate [2] on the basis of electron impact experiments (or the value 9.85 e. v. derivable from predissociation data [3]), and 11.11 e. v., suggested by Gaydon and Penney [4] from an analysis of spectroscopic data. These values together with thermochemical data lead to the values 124.9, 141.4, and 170.3 kcal./mole, respectively, for the heat of sublimation of graphite. Strong evidence for the last of these values has been presented by Brewer, Gilles, and Jenkins [5], who have reported 170.4 kcal./mole from a direct experimental determination. The value has, however, been criticized by other investigators [6,7], and has been defended by Brewer [8]. In this paper we communicate an argument which indicates that the higih values of about 170 kcal./mole for the heat of sublimation of carbon to C(g)(3P) and 11.11 e. v. for the dissociation energy of carbon monoxide are not correct, and which leads instead to the values 140 kcal./mole and 9.77 e. v., respectively.


Item Type:Article
Additional Information:Copyright © 1949 by the National Academy of Sciences Communicated May 5, 1949 Gates and Crellin Laboratories of Chemistry, Contribution No. 1297.
Record Number:CaltechAUTHORS:PAUpnas49c
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas49c
Alternative URL:http://www.pnas.org/content/vol35/issue7/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6967
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:03 Jan 2007
Last Modified:26 Dec 2012 09:27

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