Excess molar enthalpies of N,N-dimethylformamide with chloroethanes and acetates at 298.15 K

The excess molar enthalpies (H-E) at 298.15 K of N,N-dimethylformamide (DMF ) with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane , ethyl acetate, and butyl acetate have been measured, using a Parr 1451 so lution calorimeter, over the whole mole fraction range. The values of H-E a re negative for the mixtures of N,N-dimethylformamide with 1,2-dichloroetha ne and 1,1,2,2-tetrachloroethane, and an inversion of sign from positive to negative is observed in the mixture N,N-dimethylformamide with 1,1,1-trich loroethane. The HE values are positive over the whole mole fraction range f or N,N-dimethylformamide with ethyl acetate and butyl acetate. The HE data are interpreted on the basis of possible intermolecular interactions betwee n unlike molecules.