Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Densities of the mixture {water (1) + N- methylurea (2)} in concentration range to mole fraction x2= 0.07071 (or to the solution molality concentration m2= 4.22335 mol*kg-1) at atmospheric pressure in the temperature range from 274.15 K to 333.15 K and compression k = DeltaV/Vo at pressures to 100 MPa (10, 25, 50, 75 and 100) in the temperature range from 278.15 K to 323.15 K (278.15, 288.15, 288.15, 308.15, 323.15) in the same concentration range were calculated in this study. The apparent molar volumes of N-methylurea Vphi,2 and the partial molar volumes of both components V1 and V2 in the mixture, molar isothermal compressions, K_T,m, molar isobaric thermal expansions E_P,m, and isochoric coefficients of thermal pressure Beta of the mixture were calculated. Moreover, volumetric measures for the infinitely dilute solution of N-methylurea solution were calculated: limiting partial molar volumes, V_2^infinity, the limiting partial molar isothermal compressions, K_T,2^infinity, and the limiting partial molar isobaric thermal expansions, E_P,2^infinity. The results obtained are discussed from the point of view of solute - solvent and solute - solute interactions.