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The heat effects of dissolution of ethyleneurea (2-imidazolidinone) in water and methanol were measured (with an error not higher than 0.2%) at 298.15 K by using a hermetic isothermal calorimeter. The limiting (standard) molar solution enthalpies of the specified cyclic compound in different solvents were determined. Considerable weakening of the solvation of the solute was established in the case...
The enthalpies of solution of urea and its N-methyl-substituted analogues (methylurea, 1,1-dimethylurea, 1,3-dimethylurea, and 1,1,3,3-tetramethylurea) in water and methanol were measured at 298.15K. Enthalpies of transfer from water to methanol were calculated. The enthalpies of transfer of methyl-substituted ureas are endothermic, the enthalpy of transfer of urea is negative. It has been concluded...
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