Standard enthalpies of formation of cesium fluoroxysulfate (CsSO/sub 4/F) and cesium peroxydisulfate (Cs/sub 2/S/sub 2/O/sub 8/)

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50218a014· OSTI ID:6226796

Steele, W V; O'Hare, P A.G.; Appelman, E H

The enthalpies of reaction of cesium fluoroxysulfate, CsSO/sub 4/F, and cesium perocydisulfate, Cs/sub 2/S/sub 2/O/sub 8/, with HI(aq) have been measured by solution calorimetry, and the following standard enthalpies of formation at 298.15 K have been derived: ..delta..H/sub f//sup 0/(CsSO/sub 4/F(c)) = -1004.9 +- 1.6 kJ mol/sup -1/ and ..delta..H/sub f//sup 0/(Cs/sub 2/S/sub 2/O/sub 8/(c)) = -1936.7 +- 2.8 lJ mol/sup -1/. The enthalpy of solution of Cs/sub 2/S/sub 2/O/sub 8/(c) in 5345 mol of water at 298.15 K has been determined to be 79.5 +- 1.9 kJ mol/sup -1/. The Gibbs energy of solution of CsSO/sub 4/F at 298.15 K has been determined from solubility measurements to be ..delta..G/sub soln//sup 0/ (CsSO/sub 4/F) = 6.15 +- 0.40 kJ mol/sup -1/. The fluoroxysulfate results have been used in conjunction with an estimated entropy for solid CsSO/sub 4/F to calculate a standard potential of 2.52 +- 0.05 V at 298.15 K for the half-reaction SO/sub 4/F/sup -/(aq) + 2H/sup +/(aq) + 2e/sup -/ ..-->.. HSO/sup 4 -/(aq) + HF(aq). 8 tables.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 6226796
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 20:4; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CALORIMETRY
CESIUM COMPOUNDS
CESIUM FLUORIDES
CESIUM SULFATES
DATA
ENERGY
ENTHALPY
ENTROPY
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
FORMATION HEAT
FREE ENERGY
HALIDES
HALOGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION HEAT
SOLUTION HEAT
SULFATES
SULFUR COMPOUNDS
THERMODYNAMIC PROPERTIES