Due: Thursday, April 8, 1999

1. Smith, van Ness & Abbott, problem 11.22
2. Smith, van Ness & Abbott, problem 11.26.
3. Smith, van Ness & Abbott, problem 11.30.
4. Complete the following problem without using computer calculation; i.e., use only a calculator, and prepare your figures by hand using graph paper.

A mixture is formed from two substances.  At the temperature of interest, component 1 has a vapor pressure of 1.0 bar, and component 2 has a vapor pressure of 1.2 bar.

1. Prepare a P-x,y diagram for the case where the substances form an ideal solution.  What is the maximum value of the vapor pressure of the mixture?  What are the liquid and vapor compositions at this point?
2. Repeat (a), but assume that the mixture is well described by the 1-parameter Margules equation, with coefficient B (see Eq. 11.12) equal to +1.0.
3. Without doing any calculation, sketch what you think the diagram might look like if B = -1.0.

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