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 benzene, toluene, o-xylene, m-xylene, p-xylene, and styrene in the temperature range of (250 to
330) 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 uncertainties 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 polar gases. In general, the partial molar excess enthalpies and entropies
of gases in the aromatics increase with decreases of the polarities of the gases and increasing molecular size of
the gases.
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