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Thermodynamics of ammonium halogenated osmates: I. Heat capacity and thermodynamic properties of (NH4)2OsCl6at temperatures from 6 K to 325 K

✍ Scribed by Jane E. Callanan; Ron D. Weir; Edgar F. Westrum; Jr

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 492 KB
Volume: 27
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1995.0040

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✦ Synopsis

The heat capacity of ammonium hexachloroosmate (NH4)2OsCl6 was measured at temperatures from T = 6 K to 325 K by adiabatic calorimetry. Two small anomalous regions were observed in the heat-capacity against temperature plot. The lower one, from 80 E (T/K) E 140, had an excess molar enthalpy of (21.19 2 0.04)•R •K and an excess molar entropy of (0.198 2 0.006)•R. The upper one, from 200 E (T/K) E 300, had an excess molar enthalpy of (19.51 2 0.04)•R •K and an excess molar entropy of (0.076 2 0.006)•R. Smoothed values of the standard molar thermodynamic quantities for pure (NH4)2OsCl6 are tabulated up to T = 350 K.

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