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Heats and Entropies of Vaporization. The heats and entropies of vaporization a t the normal boiling points (760 mm. of Hg) given in Table VI, were calculated from the three-constant vapor pressure equation by the thermodynamic relationship. AH'^^ = TAS = R T ' [ d h P / d T J [ l

The solubilities of 2,2,4-trimethylpentane and diethyl, di-n-propyl, diisopropyl, and di-n-butyl ether in liquid ammonia were determined by means of a carrier solventgas chromatographic method. Values were obtained in the temperature range -74°to -36°C. Two immiscible liquid phases are observed in this range, except for the case of diethyl ether which exhibits an upper critical solution temperature of -42 ± 1°C.A series of Investigations was carried out in this laboratory Involving liquid-liquid extraction of various types

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