Heat Capacities of Aqueous Solutions of Acetone; 2,5-Hexanedione; Diethyl Ether; 1,2-Dimethoxyethane; Benzyl Alcohol; and Cyclohexanol at Temperatures to 523 K |
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Authors: | M Slavík J ?edlbauer K Ballerat-Busserolles V Majer |
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Institution: | (1) Department of Chemistry, Technical University of Liberec, 46117 Liberec, Czech Republic;(2) Laboratoire de Thermodynamique des Solutions et des Polymères, Université Blaise Pascal Clermont-Ferrand/CNRS, 63177 Aubière Clermont-Ferrand, France |
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Abstract: | The heat capacities of aqueous solutions of acetone, 2,5-hexanedione, diethyl ether, 1,2-dimethoxyethane, benzyl alcohol and
cyclohexanol at concentrations of 0.1 to 1.0 mol⋅kg−1 were determined at temperatures of 298.15, 423.15, 473.15 and 523.15 K and pressures up to 28 MPa. The measurements were
performed at ambient conditions using the commercial Picker differential flow calorimeter and at high temperatures and pressures
with a customized Picker type calorimeter constructed at the Blaise Pascal University, Clermont-Ferrand. Standard molar heat
capacities were obtained by weighted extrapolation to the infinite dilution limit. The contributions of –CO–, –O– and –OH
groups to the standard molar volume and standard molar heat capacity were determined from the newly determined and literature
data. The variation of the three oxygen-containing group contributions with temperature and molecular structure is examined
qualitatively. |
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Keywords: | Standard molar heat capacity Apparent molar heat capacity Standard molar volume Aqueous solution Group contribution Acetone 2 5-Hexanedione Diethyl ether 1 2-Dimethoxyethane Benzyl alcohol Cyclohexanol |
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