Solubility of Gases in Liquids. 20. Solubility of He, Ne, Ar, Kr, N2, O2, CH4, CF4, and SF6 in n-Alkanes n-ClH2l+2 (6 ≤ l ≤ 16) at 298.15 K

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The Ostwald coefficients L2,1 of He, Ne, Ar, Kr, N2, O2, CH4, CF4, and SF6 dissolved in several homologous n-alkanes, n-ClH2l+2, 6 ≤ l ≤ 16, have been measured at 298.15 K and atmospheric pressure with a modified Ben-Naim/Baer apparatus. Altogether, 99 gas/liquid systems were investigated. Both pressure control and measurement of the volume of gas dissolved in a given volume of solvent were controlled by a microprocessor. This improved, medium-precision apparatus (the imprecision is approximately ±0.5%) combines easy handling with automated data retrieval and is totally mercury-free. Data reduction is presented in some detail, including the estimation of auxiliary quantities, such as second virial coefficients and partial molar volumes at infinite dilution. The effect of chain length l upon solubility is shown, and some correlations between L2,1, or the derived Henry fugacities H2,1, and appropriate molecular and/or bulk properties of the gases and n-alkanes are discussed.