Thermodynamics of Aqueous Solutions of Nonelectrolytes. I. Enthalpies of Transfer of 1-Methyl-2-pyrrolidinone from Water to Aqueous Methanol

Molar excess enthalpies were measured for 1-methyl-2-pyrrolidinone mixed with water and with methanol over the whole concentration range and with aqueous methanol at the low mole fraction of 1-methyl-2-pyrrolidinone at 298.15 degrees K using a LKB flow microcalorimeter. Enthalpies of transfer of 1-methyl-2-pyrrolidinone from water to aqueous methanol were estimated from the molar excess enthalpies. The result was qualitatively in agreement with the conclusion described by Arnett et al.