Measurements of excess volume and ultrasonic speed were carried out for mixtures of 2,5,8-trioxanonane ((CH,0CH2CH2)20) with n-heptane at 298.15 K over the entire mole fraction range Including the region of high dilution of the ether. From these results, Isentropic compressibilities, excess Isentropic compressibilities, partial molar excess volumes, and partial molar excess Isentropic compressibilities were calculated. A qualitative discussion of the results Is presented.
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