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Apparent molar volumes and apparent molar heat capacities of aqueous solutions ofN,N- dimethylformamide andN,N- dimethylacetamide at temperatures from 278.15 to 393.15 K and at the pressure 0.35 MPa

✍ Scribed by M.L. Origlia; ; B.A. Patterson; ; E.M. Woolley

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 651 KB
Volume: 33
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.2001.0817

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✦ Synopsis

Apparent molar heat capacities C p,φ and apparent molar volumes V φ were determined for aqueous solutions of N ,N -dimethylformamide and N ,N -dimethylacetamide at temperatures from 278.15 to 393.15 K and at the pressure 0.35 MPa. The molalities investigated ranged from 0.015 mol•kg -1 to 1.0 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, differentialoutput, temperature-scanning calorimeter (NanoDSC 6100, Calorimetry Sciences Corporation, Spanish Fork, UT, U.S.A.). The results were fit by regression to equations that describe the surfaces (V φ , T, m) and (C p,φ , T, m). Infinite dilution partial molar volumes V o 2 and heat capacities C o p,2 were obtained over the range of temperatures by extrapolation of these surfaces to m = 0.

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