Vapour pressures of 1,2-dibromoethane, benzene and 1,2-dibromoethane + benzene at 5 K intervals between 283.15 and 323.15 K were measured by a static method. Following Barker’s method, the activity coefficients and the excess molar Gibbs energies were fitted to a Redlich - Kister second degree polynomial. The derived h(E) value at x = 0.5 agrees with our datum for excess molar enthalpy.