# ?The excess Gibbs energy for binary systems consisting of liquids not too dissimilar in

**Chapter 13, Problem 13.35**

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The excess Gibbs energy for binary systems consisting of liquids not too dissimilar in chemical nature is represented to a reasonable approximation by the equation:

\(G^{E} / R T=A x_{1} x_{2}\)

where A is a function of temperature only. For such systems, it is often observed that the ratio of the vapor pressures of the pure species is nearly constant over a considerable temperature range. Let this ratio be r, and determine the range of values of A, expressed as a function of r, for which no azeotrope can exist. Assume the vapor phase to be an ideal gas.

Text Transcription:

G^E/RT=A x_1x_2

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