TITLE

The excess thermodynamic properties of liquid (CH4+CD4)

AUTHOR(S)
Calado, J. C. G.; Jancsó, G.; Lopes, J. N. C.; Markó, L.; da Ponte, M. Nunes; Rebelo, L. P. N.; Staveley, L. A. K.
PUB. DATE
March 1994
SOURCE
Journal of Chemical Physics;3/15/1994, Vol. 100 Issue 6, p4582
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The vapor pressure differences between a mixture of (CH4+CD4) and CH4 and between CD4 and CH4 were measured simultaneously with the CH4 vapor pressure. This was done at 29 temperatures between 97 and 122 K, and for six different mixtures, of compositions 0.150, 0.250, 0.375, 0.500, 0.625, and 0.750 mole fraction in CD4. These mixtures exhibit very small positive deviations from Raoult’s law. Calculated excess Gibbs energies for equimolar mixtures were 0.60 J mol-1 at 100 K and 0.42 J mol-1 at 120 K. These values of GE are 2 to 3 orders of magnitude smaller than those typically found in binary mixtures of simple nonisotopic species. The molar excess enthalpy, calculated from the temperature dependence of GE, is HE(x=0.5)=(1.5±0.2) J mol-1. The experimental results were used to test three theoretical models: the vdW-1 fluid theory, 1cLJ perturbation theory, and the theory of isotope effects in mixtures. While the first two proved to be inadequate, the isotope effect theory agrees well with experiment.
ACCESSION #
7642821

 

Related Articles

  • Thermodynamic characterization of FeTeO. Dawar, Rimpi; Jain, Ashish; Babu, R.; Ananthasivan, K.; Anthonysamy, S. // Journal of Thermal Analysis & Calorimetry;Nov2015, Vol. 122 Issue 2, p885 

    The standard Gibbs energy of formation of iron tellurate, FeTeO (s), was determined by measuring the vapour pressure of TeO (g) over the phase mixture FeTeO (s) + FeO (s) in the temperature range of 1103-1203 K by employing a thermogravimetry-based transpiration technique. The temperature...

  • Thermodynamic Properties of Aqueous Lithium Bromide Using a Multiproperty Free Energy Correlation. Zhe Yuan; Herold, Keith E. // HVAC&R Research;Jul2005, Vol. 11 Issue 3, p377 

    A new correlation of the thermodynamic properties of aqueous lithium bromide was constructed based on a Gibbs free energy fundamental function. The coefficients of the function were calculated using a multiproperty curve fit to vapor pressure, specific heat, and volumetric data. The specific...

  • Thermodynamics of sublimation of calix[4]arene complexes with solvent molecules. Surov, O. V. // Russian Journal of General Chemistry;Apr2008, Vol. 78 Issue 4, p602 

    Some calix[4]arenes form complexes with solvent molecules, preserving the stoichiometric composition upon sublimation. The saturated vapor pressures of calix[4]arenes and their complexes with solvents were determined by the Knudsen effusion method in a wide temperature range. The changes in the...

  • Determination of thermodynamic stability of CdMoO4 by knudsen effusion vapor pressure measurement method. Mishra, R.; Bharadwaj, S. R.; Das, D. // Journal of Thermal Analysis & Calorimetry;Nov2006, Vol. 86 Issue 2, p547 

    Thermodynamic stability of CdMoO4 was determined by measuring the vapor pressures of Cd and MoO3 bearing gaseous species. Th vaporization reaction could be described as CdMoO4( s)+MoO2( s) =Cd( g)+2/ n(MoO3)n ( n=3, 4 and 5). The vapor pressures of the cadmium ( p Cd) and trimer ( p (MoO3)3)...

  • Saturated vapor pressure of individual substance. Supplement to interpretations and procedures for processing experimental polythermal data. Belevantsev, V.; Zherikova, K.; Morozova, N.; Malkova, V.; Igumenov, I. // Journal of Thermal Analysis & Calorimetry;Mar2012, Vol. 107 Issue 3, p1331 

    A universal (that is, actual for any reaction) interconnection between enthalpy (∆ H), entropy (∆ S), and Gibbs energy (∆ G) was applied to the analysis of the formation of saturated vapor of individual condensed (liquid and solid) substances. This allowed us to specify the...

  • Processes on the Thermodynamic Properties of Lithium Borates. Haiqing HU; Sisi ZHANG; Yafei GUO; Tianlong DENG // Advanced Materials Research;2014, Vol. 1015, p413 

    In this paper, the thermodynamic properties including the standard molar enthalpies of formation, the standard molar entropies of formation and the standard molar Gibbs free energy of formation of hydrated lithium borates and the water vapor pressures, the osmotic coefficients, the enthalpy of...

  • Interactive comment on "Development of thermodynamic potentials for fluid water, ice and seawater: a new standard for oceanography" by R. Feistel et al.  // Ocean Science Discussions;2008 Supplement, Vol. 5, pS168 

    The article presents a comment on the article "Development of Thermodynamic Potentials for Fluid Water, Ice and Seawater: A New Standard for Oceanography." It expects that the new seawater standard based on the Gibbs thermodynamic potential will replace the UNESCO equation of state. It notes...

  • Interactive comment on "Development of thermodynamic potentials for fluid water, ice and seawater: a new standard for oceanography" by R. Feistel et al.  // Ocean Science Discussions;2008 Supplement, Vol. 5, pS172 

    The article presents a comment on the article "Development of Thermodynamic Potentials for Fluid Water, Ice and Seawater: A New Standard for Oceanography." It reflects that the authors of this manuscript devices highly accurate, widely valid and empirical approximations to thermodynamic...

  • Chemical potential of a binary solution. Bulyarskii, S. V.; Prikhod�ko, V. V. // Technical Physics Letters;Apr99, Vol. 25 Issue 4, p263 

    The chemical potential of a binary solution is calculated using the Gibbs free energy method. With the aid of certain assumptions on the microscopic structure of the solution, the wellknown expression is derived for a simple solution. It is shown that the empirical interaction parameter is...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics