The enthalpies of solution of cyclohexanol, cis-1,2-cyclohexanediol, and myo-inositol in water, formamide, and dimethylsulphoxide at T = 298.15 K as well as their enthalpies of vaporization or sublimation were determined. The enthalpies of solvation were calculated from the data obtained. The contributions of the polar and non-polar groups to the behaviour of the solute molecules in polar solvents are analysed by using the enthalpy of solvation data.