Question

Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm.

Using a phase diagram, estimate its vapor pressure at 125 Degrees

Answer 1

I don't have a phase diagram for benzaldehyde. Hee is a some links that talk about reading phase diagrams. Perhaps you can find some information here..

Answer 2

ah okay? where are the links? haha

Answer 3

I forgot to post them. :-)
http://www.google.com/search?q=phase+diagrams&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Answer 4

i still don't get how to do this -.-

Answer 5

You find the line that divides liquid/gas. At T = 179 you should find the vapor pressure (on the pressure axis) = 1 atm or 760 mm Hg. So read the vapor pressure from that vapor/liquid line at 125. That should be the vapor pressure at that temperature.