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Enthalpic determinations of aliphatic ester-solvent systems with correlations

Authors:

Sirlei Roca Aécio P. Chagas Claudio Airoldi

Affiliation:

1. Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13083-970, Campinas, S?o Paulo, Brazil

Abstract:

Calorimetric measurements were carried out on ester-solvent systems where the esters were H(CH₂)_xCOO(CH₂)_yH, with x and y varying from 1 to 5, and the solvents were n-hexane and 1,2-dichloroethane. Calculation of the enthalpies of cavity formation enabled the enthalpies of interaction to be determined. Both enthalpies correlated with number of carbon atoms N, equal to x+y in the esters, giving for 1,2-dichloroethane

$begin{gathered} Delta _{cav} H_m^O = 29.4 pm 2.3 + 4.7 pm 0.4N hfill Delta _{int} H_m^O = - 53.9 pm 2.5 - 8.2 pm 0.5N hfill end{gathered}$

Keywords:	enthalpy of solution enthalpy of cavity formation enthalpy of interaction aliphatic ester 1,2-dichloroethane n-hexane
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