The standard enthalpy of formation of 1,2,3,4-tetrachlorodibenzo-<Emphasis Type="Italic">p</Emphasis>-dioxine |
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| Authors: | V A Luk’yanova T S Papina V P Kolesov N V Chelovskaya A N Fedotov P I Dem’yanov N V Avramenko V P Vorob’eva |
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| Institution: | (1) Faculty of Chemistry, Moscow State University, Leninskie gory, Moscow, 119992, Russia;(2) Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 117977, Russia |
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| Abstract: | The energy of combustion of crystalline 1,2,3,4-tetrachlorodibenzo-p-dioxine (-5122.9 ± 7.4 kJ/mol) was measured using an isothermic-shell calorimeter with a rotating platinum plated bomb. The result was used to calculate the enthalpy of combustion (-5120.4 ± 7.4 kJ/mol) and formation (?267.8 ± 7.6 kJ/mol) for the crystalline state. The enthalpy of sublimation was measured using a Calvet microcalorimeter at 411.5 K (116.0 ± 2.6 kJ/mol); recalculation to T = 298.15 K gave 118.7 ± 2.6 kJ/mol. The enthalpy of formation of 1,2,3,4-tetrachlorodibenzo-p-dioxine in the gas state was calculated (?149.1 ± 8.0 kJ/mol) |
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