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Decomposition and Thermodynamic Properties of Sn 2 S 3
Author(s) -
Wiedemeier H.,
Csillag F. J.
Publication year - 1980
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.19804690127
Subject(s) - knudsen number , chemistry , thermodynamics , standard enthalpy of formation , atmospheric temperature range , enthalpy , standard enthalpy of reaction , analytical chemistry (journal) , decomposition , entropy (arrow of time) , physics , organic chemistry , chromatography
Knudsen effusion studies of the decomposition of Sn 2 S 3 (s) have been performed employing mass spectrometry in the temperature range 669‐763 K and vacuum microbalance techniques in the range 677 ‐ 820 K yielding pressures from about 10 −2 to 10 Pa. The results demonstrate that Sn 2 S 3 (s) decomposes under present experimental conditions according to the reaction Sn 2 S 3 (s) = 2SnS(s) + 1/2 S 2 (g). The mean values for the third‐law heat and second‐law entropy of reaction based on direct mass‐loss data are ΔH° 298 = 114.0 ± 3.0 kJ/mol and ΔS° 298 = 97.3 ± 3.5 J/ K · mol. From these data the standard heat of formation and absolute entropy of Sn 2 S 3 (s) are calculated to be −254.5 ± 6.0kJ/mol and 170.5 ± 6.0 J/K · mol, respectively.