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Henry's constants (or Henry's law constants) and the infinite dilution activity coefficients of propane, propene, butane, isobutane, 1-butene, isobutene, trans-2-butene, and 1,3-butadiene in 1-butanol and 2-butanol in the temperature range of (250 to 330) K were measured by a gas stripping method. A rigorous formula for evaluating the Henry's constants from the gas stripping measurements was used for the data reduction of these highly volatile mixtures. The accuracy is about 2% for the Henry's constants and 3% for the estimated infinite dilution activity coefficients. In the evaluation of the infinite dilution activity coefficients, the nonideality of the solute cannot be neglected, especially at higher temperatures. The estimated uncertainty of the infinite dilution activity coefficients includes 1% for nonideality.

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