Abstract
Calorimetric measurements have been made of enthalpies of solution Δ sol H m ∞ in water of helium, neon, argon, krypton, xenon, methane, ethane, propane, n-butane, and oxygen at 288.15, 298.15, and 308.15 K. Values of the heat-capacity changes Δ sol C p,m ∞ have been derived. The found values for both the enthalpy and heat-capacity changes for the rare gases and for oxygen fully confirm the values derived by Benson and Krause, Jr. (1976), and Benson, Krause, Jr., and Peterson (1979) from the results of their very careful gas-solubility measurements. The partial molar heat capacities C p, 2 ∞ of the hydrocarbons studied were derived. The group-additivity schemes that have been used successfully for the estimation of values for C p, 2 ∞ for various non-ionic organic compounds do not correctly predict values of C p, 2 ∞ for the hydrocarbons in the present study.
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