The bubble and dew points of two component mixtures containing methanol (CH3OH)

Question

The bubble and dew points of two component mixtures containing methanol (CH3OH) and water (H2O) at 85°C are illustrated in the Pxy diagram below:

1600 T 85°C 1400 1200 1000 800 600 400 0.2 0.4 0.6 0.8 Mole fraction of methanol Use this figure to help answer the following questions: A. The dew point pressure of a mixture containing 70 mol% methanol should be mmHg B. The bubble point pressure of a mixture containing 80 mol% water should be mmHo C. he vapor pressure for pure water at 85 C can be found from the Pxy diagram as mmHg Submit your answers in the form: A: XXX mmHg... Note: Approximate answers will get full credit. Rounding to nearest 10 mm Hg is fine... please don't spend time getting out a ruler and making precise measurements.

Explanation / Answer

Step - 1:

We know that the Red Line in the given plot, represents the Bubble Point curve and ...

the Blue Line in the given plot represents the Dew Point curve..... therefore...........

Solutions:

From and using the data given in the given plot/ Pxy diagram.......we can find the following...answers.....

A) The Dew Point pressure of a mixture, containing 70 mol% methanol should be.... 850 mmHg....(approx.)

B) The Bubble Point pressure of the mixture, containing 80 mol% water should be.... 650 mmHg...(approx.)

C) The Vapor pressure of pure water, at 85 oC can be found from the Pxy diagram as ... 440 mmHg ...(approx.)

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