Excess molar volumes of N-methylformamide + tetrahydropyran, + 2-pentanone, + n-propylacetate at the temperatures between 298.15Â K and 313.15Â K

Excess molar volumes, VmE, of N-methylformamide (NMF) + tetrahydropyran (THP), NMF + 2-pentanone (P) and NMF + n-propylacetate (PA) have been determined at the temperatures: 298.15 K, 303.15 K, 308.15 K and 313.15 K. The results have been discussed in terms of hydrogen bonding. Excess molar volumes were fitted with the Redlich-Kister equation.