Thermodynamic properties of binary mixtures: Hexamethylphosphoric triamide (HMPA) with a non-polar liquid at 25°C
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Excess isobaric heat capacities C p E , densities π and speeds of sound u of HMPA+heptane and+benzene were measured at 25°C. C p E of both mixtures were positive in the range of small x and negative in the other region. The mixture containing benzene showed higher C p E than the heptane mixture. They both exhibited considerably smaller C V E than C p E . VE was positive for HMPA+heptane and negative for HMPA+benzene. The compressibilities K s E and K p E of both mixtures were negative. In both mixtures, non-random mixing is expected and [(CH3)2N]3PO molecules are inhomogeneously distributed.
Key WordsHexamethylphosphoric triamide heptane benzene binary mixture density speed of sound excess isobaric heat capacity
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