The Free Energy of Iodine and Hydrogen Iodide from Spectroscopic Data
- 1 June 1936
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 4 (6) , 344-350
- https://doi.org/10.1063/1.1749855
Abstract
Partition functions have been calculated for HI, I2 and I atom between 298.1 and 1500°K from spectroscopic data and the results have been fitted to a free energy equation of the usual thermodynamic form which may be differentiated and integrated to give change of heat content, specific heat and entropy for chemical reactions involving HI, I2, I and H2. The experimentally determined equilibrium constants for the reactions I2→2I and HI→½H2 +½I2 have been compared with the theoretical equilibrium constants. For the latter reaction, it is shown that the results of Bodenstein may be in error due to incorrect temperatures. Reliable values have been given for the heat of dissociation of iodine and hydrogen iodide at 25°C.Keywords
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