This work presents new data of activity coefficients at infinite dilution, gamma(infinity) of different organic solutes and water in the 1-(2-hydroxyethyl)-3-methylimidazolium trifluorotris(perfluoroethyl) phosphate, [C(2)OHmim][FAP] ionic liquid. Values of gamma(infinity) were determined for 65 organic solutes, including alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, esters, 1-nitropropane, aldehydes, acetonitrile and water by inverse gas chromatography within the temperature range from (318.15 to 368.15) K. The basic thermodynamic functions, such as partial molar excess Gibbs energies, Delta G(1)(E,infinity), enthalpies, Delta H-1(E,infinity) and entropies, Delta S-1(E,infinity) at infinite dilution were calculated from the experimental gamma(infinity) values obtained over the temperature range. Additionally the gas-liquid partition coefficients, K-L were determined. Experimental values of gas-liquid partition coefficients were used to determine the coefficients in the Abraham solvation parameter model (LFER). Results are compared to previously investigated ionic liquids with the same [C(2)OHmim](+) cation and [FAP] anion. The selectivity and capacity at infinite dilution for alkanes/thiophene extraction problems were calculated from experimental gamma(infinity) values to verify the possibility of investigated ionic liquid as an entrainer in liquid-liquid extraction. (C) 2013 Elsevier Ltd. All rights reserved.