Thermodynamic study of the sublimation of six halobenzoic acids

• Type: Article in International Scientific Journal
• Date: 2005

Authors

da Silva, MAVR (Author) FCUP; Fonseca, JMS (Author) Other; Carvalho, RPBM (Author) Other; Monte, MJS (Author) FCUP

Journal

Title: Journal of Chemical Thermodynamics

Vol. 37

Pages: 271-279

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 34 Citations

Scopus - 32 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9