1. The problem statement, all variables and given/known data For acetone (1) methanol (2) system based on Wilson equation make the following calculations: (a) BUBL P: T=60oC, =0.3 (b) DEW P: T=60oC, =0.3 (c) PT-flash: T=60oC, P=1/2 (Pbubble+ Pdew), z1=0.3 (d) If an azeotrope exist at 60oC, find Paz and x1az=y1az . The table on page 362 lists parameter values for the Antoine Equation. Parameters for Wilson equations are : a12=504.31 , a21=196.75 . 2. Relevant equations Antoine eq - calculate Psat Rackett eq - molar volume (liquid) Wilson Eq - gamma modified Rault's Law 3. The attempt at a solution The problem is not the actual solution of the problem - it is getting mathcad to produce the answers (all homework is required to be done in Mathcad for this class). See the http://www.megaupload.com/?d=YOX2IEX9" [Broken] So, after the above calculations, I need to find 3 things - bubble pressure, y1 and y2. I have 3 equations - modified Rault (1 for each species) and y1 + y2=1. I put these in a solve block, tell mathcad to find the answers and... it turns red. The solve block is on the second page. Can anyone point out what I'm doing wrong here? I run into trouble all the time with these Find functions. So far in this class I'm spending much more time trying to figure out Mathcad than I am Thermo.