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Multicomponent vapor-liquid equilibria for the five-component system NH3-N2-H2-CH4-Ar are successfully correlated in the range 273-323 K and 49 X 105 to 490 X 10* Pa. Six alternate methods were tried for evaluating vapor phase fugacity coefficients. This leads to a successful application of the Redlich-Kwong equation of state, with one of its parameters being temperature dependent for NH3, along with the mixing rules using parametric data of the pure individual components. An algorithm for computing the equilibria is given.