Enthalpies of combustion, vapour pressures, and enthalpies of sublimation of three methoxy-nitrobenzoic acids. Vapour pressures and enthalpies of sublimation of the three nitrobenzoic acids

• Type: Article in International Scientific Journal
• Date: 1999

Authors

da Silva, MAVR (Author) FCUP; Matos, MAR (Author) FCUP; Monte, MJS (Author) FCUP; Hillesheim, DM (Author) Other; Marques, MCPO (Author) Other; Vieira, NFTG (Author) Other

Journal

Title: Journal of Chemical Thermodynamics

Vol. 31

Pages: 1429-1441

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 30 Citations

Scopus - 32 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-001-2ZR

DOI: 10.1006/jcht.1999.0507

Abstract (EN): The standard (p(o) = 0.1 MPa) molar enthalpies of formation for crystalline 3-methoxy-2-nitro-, 4-methoxy 3-nitro-, and 3-methoxy-4-nitrobenzoic acid were derived from the standard molar enthalpies of combustion, in oxygen, at the temperature 298.15 K, measured by static bomb combustion calorimetry, the Knudsen mass-loss effusion technique was used to measure the vapour pressures of these crystals as functions of temperature, and the standard molar enthalpies of sublimation, at T = 298.15 K, were derived by the Clausius-Clapeyron equation. The standard molar enthalpies of sublimation, at T = 298.15 K, for the three nitrobenzoic acids were also determined using the Knudsen mass-loss effusion technique. [GRAPHICS] The standard molar enthalpies of formation in the gaseous state are shown to fit a group additivity scheme. (C) 1999 Academic Press.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13