Thermochemistry of some barium compounds |
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| Affiliation: | 1. CNRS, PHENIX, F-75005 Paris, France;2. Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, F-75005 Paris, France;3. CNRS/Université d’Orléans, UPR 3079, CEMHTI, Orléans, France;1. Department of Electronics and Communication Engineering, Malaviya National Institute of Technology, Jaipur, Rajasthan 302017, India;2. Transducers and Actuators Group, Central Electronics Engineering Research Institute, Pilani, Rajasthan 333031, India;1. Thin Film Physics Division, Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden;2. Fraunhofer Institute for Applied Solid State Physics, Tullastr. 72, 79108 Freiburg, Germany;3. Theoretical Physics Division, Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden;1. Department of Trace Element Analysis by Spectroscopy Method, Faculty of Chemistry, Adam Mickiewicz University in Poznań, 89b Umultowska Street, 61-614 Poznań, Poland;2. Department of General Chemistry, Chair of Chemistry and Clinical Biochemistry, Poznań University of Medical Sciences, 6 Grunwaldzka Street, 60-780 Poznań, Poland;3. Department of Human Nutrition and Hygiene, Poznań University of Life Sciences, 31 Wojska Polskiego Street, 60-624 Poznań, Poland;4. Department of Perinatology and Gynecology, Polish Mother''s Memorial Hospital Research Institute, 281/289 Rzgowska Street, 93-338 Łódź, Poland;5. PreMediCare New Med Medical Centre, 13 Drużbickiego Street, 61-693 Poznań, Poland;1. Swedish Defence Research Agency, FOI CBRN Defence and Security, SE-901 82 Umeå, Sweden;2. Netherlands Forensic Institute, Laan van Ypenburg 6, 2497 GB The Hague, The Netherlands;3. FERA Science Ltd., Sand Hutton, York, UK;4. DLD, Belgian Defence Laboratories, Martelarenstraat 181, B-1800 Vilvoorde, Belgium |
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| Abstract: | The molar enthalpies of reaction of metallic barium with 0.047 mol·dm−3 HClO4 as well as the molar enthalpies of dissolution of BaCl2 in 1.01 mol·dm−3 HCl and in water have been measured at T=298.15 K in a sealed swinging calorimeter with an isothermal jacket. From these results the standard molar enthalpy of formation of the barium ion in an aqueous solution at infinite dilution, as well as the enthalpies of formation of barium chloride and barium perchlorate, are calculated to be: ΔfH0m(Ba2+,aq)=−(535.83±1.25) kJ · mol−1; ΔfH0m(BaCl2,cr)=−(855.66±1.28) kJ · mol−1; and ΔfH0m(BaClO4,cr)=−(796.26±1.35) kJ · mol−1. The results obtained are discussed and compared with previous experimental values. |
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