ISSN:
1572-8927
Schlagwort(e):
Densities
;
apparent molar volumes
;
heat capacities
;
apparent molar heat capacities
;
binary aqueous solutions
;
N-methylformamide
;
water
;
amides
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The densities of mixtures ofN-methylformamide (NMF) and water (W) have been measured at 5, 15, 25, 35, and 45°C, and the heat capacities of the same system at 25°C, both over the whole mole-fraction range. From the experimental data the apparent molar volumes (Φv) and heat capacities (Φc) of NMF and of water are evaluated. The relatively small difference between the partial molar volumes or heat capacities at infinite dilution and the corresponding molar volumes or heat capacities of the pure liquids for both NMF and water suggests that with regard to these quantities replacement of a NMF molecule by a water molecule or vice versa produces no drastic changes. The partial molar volume of water at infinite dilution in NMF is smaller than the molar volume of pure water, but the corresponding partial molar heat capacity is unexpectedly high.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00655371
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