02-33U

The implicit expressions for the thermodynamic functions (grand thermodynamic potential, free energy, entropy and heat capacity) of a binary symmetrical mixture in the vicinity of the vapour-liquid critical point are obtained. The collective variables method with a reference system, as well as the procedure of a layer-by-layer integration of a grand partition function are used in our study. For the hard sphere square-well binary mixture the thermodynamic functions (entropy, heat capacity) are calculated as functions of the microscopic parameters of the system.