Determinação da entalpia de vaporização de líquidos pelo método do isoteniscópio de Smith e Menzies

Química Nova

Adriana Passarella Gerola²  Lilian Somenci Peloi²  Noboru Hioka²  Ourides Santin Filho²  Lilian Akemi Kato¹ 

[1] ,Universidade Estadual de Maringá Centro de Ciências Exatas Departamento de QuímicaMaringá PR ,Brasil

关键词: enthalpy of vaporization;    isoteniscope;    organic compounds;   

DOI  :  10.1590/S0100-40422010000200043

来源: SciELO

【 摘 要 】

This article proposes an experimental procedure to determine the enthalpy (and entropy) of vaporization of organic liquid compounds, by the Smith-Menzies (isoteniscope) method. The values of vapor pressure at different temperatures were obtained and ΔvH (and ΔvS) were graphically determined, using the Clausius-Clapeyron equation. The results for diethyl-ether, propanone, ethanol and n-hexane are in very good agreement with those from literature. A historical and thermodynamic discussion on equations that correlates vapor pressures and temperature precedes the experimental proposition.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License