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Sublimation and Dissociation of Thl 4 and ThOl 2 from Knudsen Cells
Author(s) -
Flesch R. M.,
Knacke O.,
Münstermann E.
Publication year - 1986
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19865350414
Subject(s) - sublimation (psychology) , knudsen number , dissociation (chemistry) , chemistry , vapor pressure , analytical chemistry (journal) , thermodynamics , enthalpy of sublimation , iodide , enthalpy , standard enthalpy of formation , inorganic chemistry , organic chemistry , psychology , physics , psychotherapist
The sublimation pressure of ThI 4 has been measured by the Knudsen effusion method and found to be\documentclass{article}\pagestyle{empty}\begin{document}$$ \lg {\rm p/bar} = - 11200/{\rm T} - 4.57{\rm lg T} + 24.81 $$\end{document} .Simultaneously with the sublimation of ThI 4 there is a small dissociation to lower iodide and iodine. The dissociation pressure associated with the reaction 2 ThOI 2 = ThO 2 + ThI 4 is\documentclass{article}\pagestyle{empty}\begin{document}$$ \lg {\rm p/bar} = - 15490/{\rm T} - 4.57\lg {\rm T} + 25.85 $$\end{document} The molar heat capacity of solid ThI 4 has been determined calorimetrically to be 146 J K −1 mol −1 , the heat of fusion is approximately 48 kJ mol −1 . The standard entropy of solid ThOI 2 is calculated to be 145 J K −1 mol −1 .