Homework Help: Chem

Posted by Lena on Monday, July 27, 2009 at 12:44am.

Co2(g) ---> CO2(l) + heat

This equation was given to me and asked why high pressure was needed to keep carbon dioxide in the liquid state. With the information given; I don't exactly know how to answer the question. How do you increase the pressure of a liquid. For gases you can simply decrease the volume.

Chem - DrBob222, Monday, July 27, 2009 at 12:53am
One reason is that in the gaseous state the molecules are so far apart that there is little attraction between them. At high pressures, it forces the molecules closer together (smaller volume), there is more attractions, and London forces play a bigger role in the liquifaction process. Here is an article about critical pressure and critical temperature. Perhaps it will help.
http://www.chem.purdue.edu/gchelp/liquids/critical.html
Chem - Lena, Monday, July 27, 2009 at 12:54am
Thanks :D

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