1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    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!

HELP A question on vapour pressure

  1. Oct 16, 2008 #1
    HELP!!!A question on vapour pressure

    1. The problem statement, all variables and given/known data
    The vapor pressure of dichloromethane, CH2Cl2, at 0 degree Celsius is 134 mmHg. The normal boiling point of dichloromethane is 40.0 degree Celsius. Calculate its molar heat of vaporization.


    2. Relevant equations



    3. The attempt at a solution

    ln(P_2/134)=(Change of H_vapour/8.314)(1/(0+273)-1/(40+273))
    I still have two unknown variables...I should find change H_vapour for this question, but I don't know how to figure out P_2

    Thank you for helping me.
     
  2. jcsd
  3. Oct 17, 2008 #2

    Borek

    User Avatar

    Staff: Mentor

    Re: HELP!!!A question on vapour pressure

    What does boliling mean?
     
  4. Oct 17, 2008 #3
    Re: HELP!!!A question on vapour pressure

    Boiling (also called ebullition), a type of phase transition, is the rapid vaporization of a liquid, which typically occurs when a liquid is heated to its boiling point, the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding environmental pressure
    Source: wikipedia
     
  5. Oct 17, 2008 #4

    Borek

    User Avatar

    Staff: Mentor

    Re: HELP!!!A question on vapour pressure

    Answer to your problem is directly addressed in the quote.
     
  6. Oct 17, 2008 #5
    Re: HELP!!!A question on vapour pressure

    Thanks. I have got the answer.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: HELP A question on vapour pressure
  1. Vapour pressure (Replies: 1)

Loading...