Experimental determination of the enthalpy of formation of dibenzo- p-dioxin

✍ Scribed by S.M. Pimenova; S.V. Melkhanova; V.P. Kolesov; P.I. Demyanov; A.N. Fedotov; V.P. Vorobieva

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 63 KB
• Volume: 34
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.2001.0951

✦ Synopsis

The standard molar enthalpy of combustion of dibenzo-p-dioxin (DD) was measured at T = 298.15 K by static-bomb combustion calorimetry: c H o m (cr) = -(5723.8 ± 1.4) kJ • mol -1 . The standard molar enthalpy of sublimation of this compound was measured by microcalorimetry: g cr H o m = (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: f H o m (cr) = -(141.6 ± 2.1) kJ • mol -1 and f H o m (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.