Thermodynamic study of the sublimation of six halobenzoic acids

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

da Silva, MAVR (Autor) FCUP; Fonseca, JMS (Autor) Outra; Carvalho, RPBM (Autor) Outra; Monte, MJS (Autor) FCUP

Revista

Título: Journal of Chemical Thermodynamics

Vol. 37

Páginas: 271-279

ISSN: 0021-9614

Editora: Elsevier

Indexação

ISI Web of Knowledge - 34 Citações

Scopus - 32 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

Outras Informações

ID Authenticus: P-000-4GV

DOI: 10.1016/j.jct.2004.09.005

Abstract (EN): The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of the following halobenzoic acids: 2-chlorobenzoic acid, between T = (320.16 and 339.15) K, 3-chlorobenzoic acid, between T = (320.13 and 340.13) K, 4-chlorobenzoic acid, between T= (333.15 and 356.14) K, 2-bromobenzoic acid, between T= (327.56 and 347.68) K, 3-bromobenzoic acid, between T = (327.67 and 347.60) K and 4-bromobenzoic acid, between T = (348.67 and 366.65) K. From the temperature dependence of the vapour pressure of the crystalline compounds, the standard, pdegrees = 10(5) Pa, molar enthalpies, entropies and Gibbs energies of sublimation at T= 298.15 K, were derived. A d.s.c. study of the fusion of the crystals is also presented.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9