Excess molar enthalpies of the binary systems propanone + heptane, propanone + ethanol, ethanol + heptane, and 2-propanol + water were measured at temperatures of 283.15, 298.15, 323.15, 343.15, and 363.15 K and at a pressure of 0.4 MPa. An LKB flow microcalorimeter was used. The experimental H(E) values were correlated with a modified Redlich-Kister equation.