Experimental determination of the enthalpy of formation of dibenzo- p-dioxin
| Autor: | S. V. Mel’khanova, V.P. Kolesov, S.M. Pimenova, Piotr I. Dem'yanov, V.P. Vorobieva, A. N. Fedotov |
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| Rok vydání: | 2002 |
| Předmět: |
Isothermal microcalorimetry
Chemistry Enthalpy Analytical chemistry Calorimetry Mole fraction Atomic and Molecular Physics and Optics Standard enthalpy of formation Thermochemistry Physical chemistry General Materials Science Heat of combustion Sublimation (phase transition) Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Chemical Thermodynamics. 34:385-390 |
| ISSN: | 0021-9614 |
| DOI: | 10.1006/jcht.2001.0951 |
| Popis: | The standard molar enthalpy of combustion of dibenzo- p -dioxin (DD) was measured at T = 298.15 K by static-bomb combustion calorimetry: ΔcHmo(cr) = − (5723.8 ± 1.4)kJ · mol − 1. The standard molar enthalpy of sublimation of this compound was measured by microcalorimetry: ΔcrgHmo = (91.45 ± 0.76)kJ · mol − 1. These values were used to derive the standard molar enthalpies of formation of DD in the crystalline and gaseous states: ΔfHmo(cr) = − (141.6 ± 2.1)kJ · mol − 1and ΔfHmo(g) = − (50.1 ± 2.2)kJ · mol − 1. The specially obtained sample of DD of high purity {mole fraction x = (0.9999 ± 0.0001)} was used in all measurements. |
| Databáze: | OpenAIRE |
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