1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Coexistance Curve

  1. Apr 9, 2010 #1
    1. The problem statement, all variables and given/known data
    Consider the liquid-gas coexistence curve. Show that C[tex]_{(g)}[/tex] − C[tex]_{(l)}[/tex] = T([tex]\stackrel{d}{dT}[/tex] [tex]\Delta[/tex][tex]_{(vap)}[/tex]S) for T, P along the coexistence curve. Now use the fact that
    [tex]\Delta[/tex](vap)S = [tex]\Delta[/tex](vap)H/T along the coexistence curve, and the fact that [tex]\Delta[/tex](vap)H is positive and decreases with increasing T, to show that C(g) < C(l) . Note that this inequality applies only at Tvap.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 10, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Please show us what you have tried. We can not help you unless you first put in some effort.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook