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Journal of Solution Chemistry

, Volume 23, Issue 9, pp 989–996 | Cite as

Thermodynamic properties of binary mixtures: Hexamethylphosphoric triamide (HMPA) with a non-polar liquid at 25°C

  • Katsutoshi Tamura
  • Sachio Murakami
  • Masato Fukumori
  • Yoshimasa Akagi
  • Yoshikane Kawasaki
Article

Abstract

Excess isobaric heat capacities C p E , densities π and speeds of sound u of HMPA+heptane and+benzene were measured at 25°C. C p E of both mixtures were positive in the range of small x and negative in the other region. The mixture containing benzene showed higher C p E than the heptane mixture. They both exhibited considerably smaller C V E than C p E . VE was positive for HMPA+heptane and negative for HMPA+benzene. The compressibilities K s E and K p E of both mixtures were negative. In both mixtures, non-random mixing is expected and [(CH3)2N]3PO molecules are inhomogeneously distributed.

Key Words

Hexamethylphosphoric triamide heptane benzene binary mixture density speed of sound excess isobaric heat capacity 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Katsutoshi Tamura
    • 1
  • Sachio Murakami
    • 1
  • Masato Fukumori
    • 2
  • Yoshimasa Akagi
    • 2
  • Yoshikane Kawasaki
    • 2
  1. 1.Department of Chemistry, Faculty of ScienceOsaka City UniversityOsaka 558Japan
  2. 2.Department of Applied ChemistryOsaka Institute of TechnologyOsaka 534Japan

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