To study the relation between molecular structure of components and properties of the mixtures containing methyl methylthiomethyl sulfoxide (MMTSO), CH
3 (CH
3SCH
2) 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 15cm
3 of each component for a series of runs of one mixture over the whole range of mole fraction at a temperature.
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