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Q#1 GATE CH 2015 NAT +2 marks -0 marks

A binary mixture of components (1) and (2) forms an azeotrope at  and . The liquid phase non-ideality is described by  and , where  are the activity coefficients, and  are the liquid phase mole fractions. For both components, the fugacity coefficients are 0.9 at the azeotropic composition. Saturated vapor pressures at  are  70 bar and  bar.

The total pressure in bars for the above azeotropic system (up to two decimal places) is
.

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