Henry's law constants and infinite dilution activity coefficients of propane, propene, butane, 2-methylpropane, 1-butene, 2-methylpropene, trans-2-butene, cis-2-butene, 1,3-butadiene, dimethyl ether, chloroethane, and 1,1-difluoroethane in 2-methylphenol, 3-methylphenol, and 4-methylphenol in the temperature range of (290 to 340) K were measured by a gas stripping method, and partial molar excess enthalpies and entropies were evaluated from the activity coefficients. A rigorous formula for evaluating the Henry's law constants from the gas stripping measurements was used for the data reduction of these highly volatile mixtures. The estimated accuracies are about 2 % for the Henry's law constants and 3 % for the infinite dilution activity coefficients. The Henry's law constants followed the order of increasing Henry's law constant with decreases in the normal boiling point temperature of the liquefied gas except for polar gases. The activity coefficients of the solutes in 2-methylphenol were smaller than those in 3-methylphenol and 4-methylphenol, and the activity coefficients of solutes in 3-methylphenol had similar values to those in 4-methylphenol.