Viscosities and Volumes of Dilute Solutions of Formamide in Water + Acetonitrile and for Formamide and N,N-Dimethylformamide in Methanol + Acetonitrile Mixed Solvents: Viscosity B-Coefficients, Activation Free Energies for Viscous Flow, and Partial Molar Volumes

The viscosity B -coefficients and partial molar volumes have been measured for N, N -dimethylformamide and formamide in methanol + acetonitrile solvent systems and for N, N -dimethylformamide in water + acetonitrile mixed solvents. These data are used to calculate the solute contribution to the activation free energy for viscous flow, Δμ ≠ 13, for these systems. It is found that the Δμ ≠ 13 values are simply related to the corresponding enthalpies of transfer.