| Abstract
| - The enthalpies of solution of the n-alcohols, ethanol to hexanol, have been measured in aqueous mixtures offormamide, N,N-dimethylacetamide and N-methylpyrrolidinone. The average enthalpy of transfer of the −CH2−moiety, ΔtHθ(CH2), from the organic solvents to the mixtures and to pure water are determined from thedifferences between the enthalpies of transfer of the alcohols. The ΔtHθ(CH2) values pass through maxima inthe highly aqueous composition region, with the height of the maximum increasing linearly with the area ofthe hydrophobic surfaces of the cosolvent. These results are compared to similar data for the aqueous alcoholsolvent systems where the maximum in ΔtHθ(CH2) is also sensibly linear in the area of the cosolventhydrophobic surfaces but increases more rapidly with increasing hydrophobic area.
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