onsider a solution containing two similar liquids which are miscible in all proportions over a wide temperature range. The excess Gibbs energy of this solution can be modeled as: ∆??? = ??1?2 where A is a constant depending only on temperature. Over a wide temperature range the ratio of the vapor pressures of the two components is constant and equal to 1.649. Over this same temperature range, the vapor phase may assumed to be ideal. What values of A may permit formation of an azeotrope

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