“…In addition, with the number of materials, the experimental problems increase dramatically. As a result, several papers on the prediction of physicochemical properties such as molar volume, molar enthalpy, density, viscosity and refractive indices have been published in recent decades [1][2][3][4][5][6][7][8][9]. In this paper, the excess molar volume of quaternary system n-hexanol + ethanenitrile + dichloromethane + tetrahydrofuran at 298.15 K is determinate by using Toop model [10], Hillert model [11], Kohler model [12], Muggianu model [13] and Chou model [14,15].…”