Thermodynamics of Liquid Mixtures Containing Methyl Methylthiomethyl Sulfoxide. II. Excess Enthalpies of (Water+, Benzene+, Dimethyl Sulfoxide+Methyl Methylthiomethyl Sulfoxide) and (Water+, Benzene+ Dimethyl Sulfoxide) at 298.15 and 318.15K

抄録

To study the relation between molecular structure of components and properties of the mixtures containing methyl methylthiomethyl sulfoxide (MMTSO), CH₃ (CH₃SCH₂) SO, excess molar enthalpies of the title mixtures have been determined over the whole range of mole fraction by using a twin-microcalorimeter of heat-conduction type. The excess enthalpies obtained for the mixtures of MMTSO show similar tendencies to those of DMSO. The mixture (DMSO+MMTSO) has been found to be nearly athermal. Derived excess partial molar enthalpy of benzene of {(1-x)benzene+xMMTSO} at 298.15K shows a maximum at x=0.91. The minima of excess partial molar enthalpy of water observed at x=0.62 (at 298.15K) and 0.71(at 318.15K) for {(1-x)water+xMMTSO} are discussed, as well as those observed at x=0.77 (at 298.15K) and 0.73 (at 318.15K) for {(1-x)water+x DMSO}. Measurements on the present apparatus require only 15cm³ of each component for a series of runs of one mixture over the whole range of mole fraction at a temperature.