Abstract
Dilatometric measurements of excess volume V E and ultrasonic speed u have been carried out for mixtures of mono-, di-, tri- and tetra(ethylene glycol)s in pyrrolidin-2-one (PY) over the whole mole fraction range at 303.15 K. In the mixture of PY and monoethylene glycol, the V E is positive except for slight negative variation at the high mole fraction of PY. The other three mixtures PY+di-, + tri- and + tetra(ethylene glycol)s show negative V E over the entire composition range in the order di-<tri-<tetra-. There is a decrease in the values of ultrasonic speed u with increase in the mole fraction of PY in the case of monoethylene glycol while for other three systems u rises. From these measurements, partial molar quantities V i E and K S, i E have been calculated and analysed. Estimates of isentropic molar quantity K S equal to −( ∂V/ ∂p) S and its excess counterpart K S E have also been computed. The K S E is positive for mono-, and negative for all the other mixtures over the whole composition range.
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