Hydrophobic effect in aqueous solutions of nonelectrolytes. II. Cross-interactions of alkylureas
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The heats of mixing of the aqueous solutions of monomethylurea, monoethylurea, 1,3-dimethylurea, 1,3-diethylurea were determined at 25°C. The excess enthalpies obtained are expressed in virial form, in terms of pair and triplet interaction coefficients. A method previously discussed for predicting the excess enthalpies and the interaction coefficients of ternary solutions has been applied to the alkylureas. The large deviations between the experimental and calculated values, led to the modification of that method, which better accounts for the marked mixed character of these substances.
Key wordsHydrophobic interactions alkylureas excess enthalpy effectiveness coefficient ternary systems
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