Apparent molar volumes and apparent molar heat capacities of aqueous solutions of isomeric butanols at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa |
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| Institution: | 1. Department of Medicine, School of Medicine, College of Health Science, Moi University, Eldoret, Kenya;2. Center for Statistical Sciences, School of Public Health, Brown University, Providence, RI, USA;3. Department of Epidemiology, School of Public Health, Brown University, Providence, RI, USA;4. The Warren Alpert School of Medicine, Brown University, Providence, RI, USA;5. Department of Biostatistics and Center for Statistical Sciences, School of Public Health, Brown University, Providence, RI, USA |
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| Abstract: | Apparent molar heat capacities Cp, φand apparent molar volumesVφ were determined for aqueous solutions of 1-butanol, 2-butanol (both R andS isomers), isobutanol (2-methyl-1-propanol), and t -butanol (2-methyl-2-propanol) at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa. The molalities investigated ranged from 0.02 mol · kg − 1to 0.5 mol · kg − 1. We used a vibrating-tube densimeter (DMA 512P, Anton Paar, Austria) to determine the densities and volumetric properties. Heat capacities were obtained using a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetry Sciences Corporation, Provo, UT, U.S.A.). The results were fit by regression to equations that describe the surfaces (Vφ, T, m) and (Cp,φ, T, m). Infinite dilution partial molar volumesV2o and heat capacities Cp,2owere obtained over the range of temperatures by extrapolation of these surfaces to m = 0. |
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