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.
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Acknowledgment
One of the authors (MCh) is profoundly indebted to Prof. H. Piekarski (University of Łódź) for advice concerning the subject and the measurement technique of heat capacity applied in this study.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Przybyła, A., Chorążewski, M., Zorębski, E. et al. Thermodynamic and Acoustic Properties of Mixtures of Dibromomethane + Heptane. Int J Thermophys 32, 852–866 (2011). https://doi.org/10.1007/s10765-010-0773-1
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DOI: https://doi.org/10.1007/s10765-010-0773-1