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Values of the fifth virial coefficient, compressibility factors, andfluid-fluid coexistence curves of binary asymmetric nonadditive mixtures ofhard disks are reported. The former correspond to a wide range of size ratiosand positive nonadditivities and have been obtained through a standard MonteCarlo method for the computation of the corresponding cluster integrals. Thecompressibility factors as functions of density, derived from canonical MonteCarlo simulations, have been obtained for two values of the size ratio ($q=0.4$and $q=0.5$), a value of the nonadditivity parameter $\Delta=0.3$), and fivevalues of the mole fraction of the species with the biggest diameter($x_1=0.1$, $0.3$, $0.5$, $0.7$, and $0.9$). Some points of the coexistenceline relative to the fluid-fluid phase transition for the same values of thesize ratios and nonadditivity parameter have been obtained from Gibbs EnsembleMonte Carlo simulations. A comparison is made between the numerical results andthose that follow from some theoretical equations of state.

Virial coefficients, equation of state, and demixing of binary asymmetric nonadditive hard-disk mixtures