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. Can. J. Chem. 56,24(1978). Measurements at 25'C with flow calorimeters and densimeters have led to heat capacities and densities of aqueous solutions of I I 1 : 1 electrolytes: NaClO,, NaBrO,, NaIO,, NaNO,, NaC104, NH4N03, KCIO,, KBrO,, KIO,, NH4CI, and NH4C104. The first 6 salts were studied up to near saturation. We have used results of these measurements to obtain apparent molal heat capacities and apparent molal volumes of the various solutes. Extrapolation to infinite dilution on the basis of the Debye-Hiickel theory has led to r$,O and + v O values for each solute. We have compared these standard values with results of earlier investigations. ALAIN ROUX, GOOLAM M. MUSBALLY, GBRALD PERRON, JACQUES E. DESNOYERS, PREM PAUL SINGH, EARL M. WOOLLEY et LOREN G. HEPLER. Can. J. Chem. 56,24 (1978).Des mesures de capacites calorifiques et de densites ont kt6 effectuees a 25°C au moyen de microcalorimttres et de densimttres dynamiques sur des solutions aqueuses de 11 electrolytes 1 : 1 : NaCIO,, NaBrO,, NaIO,, NaNO,, NaCI04, NH,NO,, K c l o , , KBrO,, KIO,, NH4CI et NH4CI04. Les 6 premiers sels ont ete etudies presque jusqu'a la saturation. Les capacites calorifiques et volumes molaires apparents ont ett calcules et extrapoles a dilution infinie en se basant sur la theorie de Debye-Hiickel. Ces valeurs standards r$c" et r$vQ ont ete comparees aux valeurs anterieurement publiees.

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The saturation vapor pressures of ten mixtures of the binary systems (I) acetone -chloroform, (2) acetone -carbon tetrachloride, and (3) benzene -carbon tetrachloride have been determined, from 100 to 230" for system 1 and from 100" up to the highest temperature at which llquid and vapor coexist for systems 2 and 3. The system acetone -chloroform could not be studied at higher temperatures because of decomposition.The gas-liquid critical temperatures of the three binary systems have been determined by the disappearance of meniscus method. The orthobaric compositions of the vapor-liquid equilibria of the I binary systems have been measured from 100 to 180' for system 1 and from 100" to the critical region for systems 2 and 3, using a glass bomb enclosed in a steel bomb.From the vapor-liquid composition curves and the vapor pressure curves at constant temperatures I (100, 150, 160, 170, and 180°), the existence of an azeotrope in the system acetone-chloroform at these temperatures, and having a composition of 36.2 mole% acetone at low, was confirmed. The composition of the azeotrope shifts towards lower acetone content as the temperature is raised. Azeotropes were not found In the systems acetone -carbon tetrachloride and benzene -carbon tetrachloride, over the ranges of temperature and pressure of this research. The data of the binary systems were treated thermodynamically to yield the liquid phase activity i coefficients and, as suggested by Chueh and Prausnitz, the Redlick-Kwong equation was used in a modified form to obtain the fugacity coefficients of components in the vapor phase. Several liquid phase parameters, such as the binary interaction constant, Henry's constant, and dilation constant have been calculated, using the van Laar equation as modified by Chueh and Prausnitz.I