Abstract
Expressions for the fifth coefficient are obtained for the Percus—Yevick (PY) theory, the convolution or hypernetted-chain (CHNC) theory, the self-consistent approximations of Rowlinson and Hurst (SCA), the PY2 theory and the CHNC2 theory. Numerical values for the fifth virial coefficient are computed using the 6:12 potential. Comparison with Barker's calculations of the exact fifth virial coefficient shows that the PY, CHNC, and SCA results are unsatisfactory. However, the PY2 and CHNC2 fifth virial coefficients are in good agreement with the exact results. The PY2 fifth compressibility virial coefficient is particularly accurate.
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