Chemical potential for simple fluids from equations of state

The chemical potential for both the hard-sphere and the Lennard-Jones syste ms is calculated from analytical equations of state proposed in the literat ure and results are compared with data obtained by different authors from c omputer simulations. Eighteen equations of state for hard spheres, some of them recently published, were considered, and for the Lennard-Jones system three semi-empirical equations and two semi-theoretical ones, one of the la tter being proposed by us in a previous work. Good agreement, except for pa rticular expressions and/or particular temperature or density ranges, is fo und for most cases and for both hard-sphere and Lennard-Jones fluids. Our r esults indicate that the use of expressions which are more complex than the Carnahan-Stariing equation for hard spheres up than our proposal For Lenna rd-Jones fluids is not needed to obtain the chemical potential accurately.