Speeds of sound and isentropic compressibilities of (n-alkoxyethanols + toluene) at T = 298.15 K |
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| Institution: | 1. Department of Chemistry, Kurukshetra University, Kurukshetra 136119, India;2. Department of Chemistry, Dyal Singh College, Karnal 132001, India;1. Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, CO 80305-3337, United States;2. Chemistry Faculty, Belarusian State University, Leningradskaya 14, 220030 Minsk, Belarus;3. Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294-1240, United States;1. Department of Physical Chemistry, University of Rostock, Dr-Lorenz-Weg 1, 18059 Rostock, Germany;2. Department of Physical Chemistry, Kazan Federal University, Kremlevskaya str. 18, 420008 Kazan, Russia;3. Chemistry Faculty, Belarusian State University, Leningradskaya 14, 220030 Minsk, Belarus;4. Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, CO 80305-3337, USA;5. Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4+6, D-53115 Bonn, Germany;1. Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany;2. Jülich-Aachen Research Alliance, High Performance Computing (JARA-HPC), Schinkelstraße 2, 52062 Aachen, Germany;1. Department of Physics, S R Engineering College (Autonomous), Warangal 506371, Telangana, India;2. Department of Physics, New Science Degree and P.G. College, Warangal 506001, Telangana, India;3. Department of Physics, Kakatiya University, Warangal 506009, Telangana, India |
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| Abstract: | Speeds of sound u at the temperature 298.15 K for six ( n -alkoxyethanol + toluene) were measured over the whole composition range. The n -alkoxyethanols were 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-(2-methoxyethoxy)ethanol, 2-(2-ethoxyethoxy)ethanol, and 2-(2-butoxyethoxy)ethanol. Excess molar volumes VmE atT = 298.15 K were also measured for the mixtures of toluene and 2-methoxyethanol, 2-ethoxyethanol, or 2-butoxyethanol over the whole composition range. The speed of sound values were combined with excess molar volumes to obtain values for the product KS, m of the molar volume and the isentropic compressibilityκS , and the corresponding excess quantities KS,mE were also calculated. The KS,mE curves are sigmoid for all mixtures. The deviations of the speeds of sounduD from their values uid in an ideal mixture were obtained for all measured mole fractions. These values are compared with the mixing function δu calculated in the paper. The behaviour ofu , uD, δu, and KS,mE as a function of composition and number of carbon atoms in the aliphatic chain of the alkoxyethanol is discussed. Also, theoretical values of the molar isentropic compressibility KS,m and speed of sound u were calculated using the Prigogine-Flory-Patterson theory with a van der Waals potential energy model and the results compared with experimental data. |
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