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Van Der Waals equation solving for V

  1. Sep 1, 2009 #1
    1. The problem statement, all variables and given/known data

    P = RT/(V-b) - a/V^2

    Ive been trying to solve this for V and just cant get it.

    2. Relevant equations


    3. The attempt at a solution
    IVe gotten to:
    RTV^2 -aV+ab = P(V^3-V^2b)
    Any Ideas?
     
  2. jcsd
  3. Sep 1, 2009 #2

    berkeman

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    Staff: Mentor

    Could you use more parenthesis to make the equation clearer? Or is its form just as written:

    [tex]P = \frac{RT}{V-b} - \frac{a}{V^2}[/tex]
     
  4. Sep 1, 2009 #3

    berkeman

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    Staff: Mentor

    From your partial solution, it does look like that was the original form. Collect terms and factor for V would be the next steps...

    [tex]()V^3 + ()V^2 + ()V + () = 0[/tex]
     
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