Standard enthalpies of formation of 3-hydroxyphthalic anhydride



Título del documento: Standard enthalpies of formation of 3-hydroxyphthalic anhydride
Revista: Revista mexicana de física
Base de datos: PERIÓDICA
Número de sistema: 000460632
ISSN: 0035-001X
Autores: 1
1
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1
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1
Instituciones: 1Benemérita Universidad Autónoma de Puebla, Facultad de Ingeniería Química, Puebla. México
Año:
Periodo: Nov-Dic
Volumen: 68
Número: 6
País: México
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, teórico
Resumen en inglés In this investigation thermochemical properties of 3-hydroxyphthalic anhydride were determined. Fusion enthalpy, fusion temperature and molar heat capacity in solid phase were obtained by differential scanning calorimetry. By the Knudsen effusion method, the molar enthalpy of sublimation at 298.15 K was obtained. By thermogravimetric data, it was possible to determine the molar enthalpy of sublimation and the molar enthalpy of vaporization. On the other hand, the molar enthalpy of formation in solid phase at 298.15 K was determined by combustion calorimetry. The molar enthalpy of formation in gas phase at 298.15 K was calculated from molar enthalpy of sublimation at 298.15 K and molar enthalpy of formation in solid phase at 298.15 K. This experimental value was compared both theoretical enthalpy of formation in gas phase by using Gaussian methods at the G3 and G4 levels and with an estimated value in relation to phthalic anhydride
Disciplinas: Física y astronomía
Palabras clave: Física,
Anhídrido 3-hidroxiftálico,
Termogravimetría,
Efusión Knudsen,
Calorimetría de combustión,
Entalpía de formación
Keyword: Physics,
3-hydroxyphthalic anhydride,
Thermogravimetry,
Knudsen effusion,
Calorimetry combustion,
Enthalpy of formation
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