THE CONSTRUCTION, TESTING AND USE OF A NEW KNUDSEN EFFUSION APPARATUS

• Tipo: Artigo em Revista Científica Internacional
• Data: 1990

Autores

DASILVA, MAVR (Autor) FCUP; MONTE, MJS (Autor) FCUP

Revista

Título: Thermochimica Acta

Vol. 171

Páginas: 169-183

ISSN: 0040-6031

Editora: Elsevier

Indexação

ISI Web of Knowledge - 149 Citações

Scopus - 156 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-RD7

DOI: 10.1016/0040-6031(90)87017-7

Abstract (EN): The construction of a new Knudsen effusion apparatus for measuring vapour pressures of organic and organometallic solids as a function of temperature and the subsequent calculation of enthalpies of sublimation are described. The new apparatus enables the simultaneous operation of three different effusion cells, reducing, considerably, the time necessary for the study of each compound. The performance of the apparatus was checked by measuring, as a function of temperature, the vapour pressure of benzoic acid (between 307.15 and 314.15 K) and ferrocene (between 292.27 and 300.01 K), from which their standard molar enthalpies of sublimation, at 298.15 K, were derived: benzoic acid, ¿cr gH298.15 XXX = 89.25±0.85 kJ mol-1; ferrocene, ¿cr gH298.15 XXX = 72.39 ± 1.00 kJ mol-1. © 1990.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15