A flow-mixing calorimeter has been used to measure the excess molar enthalpy H-m(E) of (cyclohexane + dichloromethane)(g) and (benzene + dichloromethane)(g) at standard atmospheric pressure over the temperature range (353.2 to 453.2) K. The non-ideality of the cyclohexane and benzene was fitted using the Kihara potential, and that of the dichloromethane using the Stockmayer potential. Cross-terms were calculated using the equation epsilon(12) = (1 - k(12))(epsilon(11)epsilon(22))(1/2), and to fit the measurements on (cyclohexane + dichloromethane)(g) the value (1 - k(12)) = 1.005 was needed. This value was used to calculate H-m(E) for (benzene + dichloromethane)(g), and the calculated values were found to be positive and about as large as those for (cyclohexane + dichloromethane)(g). However the experimental values are negative, and at T = 353.2 K are about 50 J.mol(-1) below the values for (cyclohexane + dichloromethane)(g). The difference between the calculated and experimental values was described in terms of a quasi-chemical model which, for the benzene-dichloromethane interaction, yielded a value of the equilibrium constant K-12 (298.15 K) = 0.323 MPa-1 and an enthalpy of association Delta H-12 = -(12.8 +/- 3) kJ.mol(-1) This value of Delta H-12 is attributed to charge transfer between benzene and dichloromethane which is not present in the cyclohexane-dichloromethane interaction.