Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Thermodynamic and Acoustic Properties of Mixtures of Dibromomethane + Heptane

Przybyla, A.[Anna], Chorazewski, M.[Miroslaw], Zorebski, E.[Edward], Marczak, W.[Wojciech]
Int. J. Thermophys. 2011, 32, 4, 852-866
ABSTRACT
Densities and speeds of ultrasound in binary mixtures of dibromomethane with heptane have been measured within the temperature range from 288.15 K to 318.15 K. From the experimental data, the thermodynamic excess volume, molar isobaric expansion, molar isentropic compression, and ultrasonic speed were calculated. The excess volume and excess isentropic compression have opposite signs, whereas the excess isobaric expansion is an S-shaped function of the mole fraction. An explanation was suggested to account for the excesses in terms of intermolecular interactions. It involved energetic and steric factors. Moreover, it was shown that the positive excess sound speed results almost entirely from the negative excess compression.
Compounds
# Formula Name
1 C7H16 heptane
2 CH2Br2 dibromomethane
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Refractive index (Na D-line) ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Standard Abbe refractometry
  • 1
  • POMD
  • 2
  • Refractive index (Na D-line) ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Standard Abbe refractometry
  • 1
  • POMD
  • 2
  • 1
  • Speed of sound, m/s ; Liquid
  • Mole fraction - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Pulse-echo method
  • 55
  • POMD
  • 2
  • 1
  • Mass density, kg/m3 ; Liquid
  • Mole fraction - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 91