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Theoretical estimation of heat capacity of binary liquid mixtures at different temperatures by associated and non associated processes

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Author Affiliations

  • 1Department of Chemistry, Janta College Bakewar (206124), Etawah, India
  • 2Department of Agriculture Chemistry, Janta College Bakewar (206124), Etawah, India
  • 3Department of Chemistry, Raghunath Girls P.G. College, Meerut (250001), India
  • 4Department of Chemistry, D.B.S P.G. College, Govind nagar (208006), Kanpur, India

Res.J.chem.sci., Volume 14, Issue (1), Pages 16-20, February,18 (2024)

Abstract

In the present investigation experimental density (ρ), ultrasonic speed (U), thermal expansion coefficient (α) isothermal compressibility (βT), characteristic pressure (P*), characteristic volume (V*) and characteristic temperature (T*) were used to evaluate heat capacity (CP) of two weakly interacting binary liquid mixtures such as 1-butanol+dodecane and 2-butanol+dodecane over the entire range of concentration and atmospheric pressure from 288.15-318.15K by Prigogine-Flory-Patterson model based on non- associated process. Ramaswamy (RS) as well as model devised by Glinski (GLI) based on association process were also considered for evaluation of aforementioned thermodynamic properties at different temperatures. Deviations of heat capacity were fitted to redlich kister polynomial to estimate the binary coefficient and standard deviation. McAllister Multi body interaction model was used to correlate the experimental findings. Results were discussed in terms of average absolute % deviation for both the liquid mixtures at different temperatures. McAllister four body (Mc4) was found to be more consistent than McAllister three body (Mc3) model. Excess heat capacities of binary liquid mixtures were also computed to analyze the intermolecular interactions. Prigogine-Flory-Patterson model deals a fair agreement with experimental findings in comparison to other two models based on associated process.

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