Question

A mixture containing equal amounts of n-butanol, ethanol, and ethylbenzene at 100°C is contained in a...

A mixture containing equal amounts of n-butanol, ethanol, and ethylbenzene at 100°C is contained in a vessel. You may assume that this is an ideal system. a. What is the bubblepoint pressure of this mixture? b. What is the dewpoint pressure of this mixture? c. If the mixture is at 800 mm Hg, what phase is present?

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Answer #1

(a) bubble point is the place where the first bubble of vapour is formed

from Roult's law

P= P0A x XA +P0B x XB +P0C x XC

From Antonies equation

P= A - B/(C+T)

  • BY combining these two equations bubble point could be calculated

(b) Dew point is the place where the first drop of vapour condensed

from roult's law

1/P=XA /P0A + XB /P0B + XC /P0C

  • By combining antonie's equation and this equation the dew point could be calculated

(c) After calculating bubble point and dew point ; if

  1. 800 mmHg <P liquid phase
  2. 800 mmHg> P gas phase
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