Specific heats of aqueous solutions of various alkali halides (LiCl, KC1, KF, CsCl, and Csl) and alkylammonium salts (CH3NH3CI, C2H5NH3CI, and ÍM-C4H9) 4NBr) have been measured in the temperature range of 30-130°with an adiabatic calorimeter. The apparent molal heat capacities *CP evaluated from the heat capacity data are negative in the case of the investigated alkali halides and positive in the case of the alkylammonium salts.The temperature dependence of reveals a maximum at about 50-90°for all cases except (W-C4H9) 4NBr. Approximate values for the partial molal heat capacities CP2°c an be obtained by extrapolation of to infinite dilution. The influence of the dissolved salts on the solvent structure and the contribution of the solventsolute interaction to the partial molal heat capacities are discussed.

Xenon and fluorine combine readily. Xenon tetrafluoride is a colorless crystalline material, stable at room remperature. The existence of at least one other fluoride and two oxyfluorides has been demonstrated. The heaviest "inert gas," radon, also reacts with fluorine, yielding a compound less volatile than xenon tetrafluoride.

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The infrared and Raman spectra of KrF2 vapor have been obtained. They clearly indicate a linear and symmetric molecule with the symmetric stretching frequency at 449 cm−1, the asymmetric stretching frequency at 588 cm−1, and the bending frequency at 232.6 cm−1. The force constants are fr=2.46, frr=−0.20, and fα=0.21 mdyn/Å. The negative bond—bond interaction constant can be explained neither by valence bond models nor by a simple molecular orbital model.

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