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Clausius Clapeyron equation

  1. Feb 3, 2008 #1
    1. The problem statement, all variables and given/known data

    slope: -8.000 x 10^3 K
    The graph is of ln vapor pressure of a gas vs. invert kelvin temperature
    Using the Clausius Clapeyron equation, find Hvap (heat of vaporization)

    2. Relevant equations

    Clausius Clapeyron equation: ln P= (-delta Hvap/R)*(1/T) + C

    3. The attempt at a solution

    I tried using the given slope in the equation as T. Then I tried using y=mb. I multiplied the slope by 100K thinking I could find lnP.
  2. jcsd
  3. Feb 4, 2008 #2


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    In this example you have the equation in the form of a line already.

    y=mx + b

    where y is lnP, m is -deltaHvap/R, x is 1/T and b is C. You are asked to determine the value of -deltaHvap given that the slope (m) is -8000 K.

    Can you find a way to tease out the -deltaHvap from the expression for the slope (-8000 K = -deltaHvap/R)?
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