Partial molal enthalpies, entropies, and internal energies are reported for hydrogen in liquid-benzene solutions at temperatures up to 250°C, pressures up to 150 atm, and hydrogen concentrations up to 13 mole %. Both the cohesive energy density ratio a12/a11 and the pressure at which the entropy of mixing becomes ideal, turn out to be roughly independent of temperature and hydrocarbon type.
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John Connolly (1962) studied this question.