# Discussion and Feedback Regarding Problem Solutions

Anny comments and suggestions regarding the problems and problem solutions are welcome here ….

Anny comments and suggestions regarding the problems and problem solutions are welcome here ….

2 comments

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In Problem 5.10 – Regression of Isobaric VLE Data for the System Methanol – Toluene there is a mistake in the Mathcad solution provided in the Webpage. In the section “Regression Using the UNIQUAC Model”, where the optimized parameters are founded, the following error appears when the program performs the solution: “This value has units: Unitless, but must have units: Temperature^-1.” You can see it, as an image file, in the link: http://i43.tinypic.com/2q15p5k.png

Any help would be very appreciated.

Thank you!

This must be due to the different version of Mathcad. I used the rather outdated 2001, recent versions are more picky with respect to values with units. Which Mathcad version are you using?