Agreed thermodynamical model of multicomponent mixture with mass transfer

It is considered an agreed thermodynamical model of compressible multicomponent mixtures with mass exchange between phases. The model allows to receive phase equilibrium surfaces and other thermodynamic functions in analytical form for isothermal case. The simple state equations and model Gibbs potential are offered correctly to describe thermodynamical behavior of gas-oil solutions in some range of parameters, which is interesting for practice. The model is convenient for numerical modeling of compositional flow of compressible fluids in porous media: it is reduced required computing resources, reliability of the account increases; it is exclude some unphysical decision.