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Homework Help: Solving for volume in Van der Waals Equation?

  1. Dec 1, 2009 #1
    Solving for volume in Van der Waals Equation??

    1. The problem statement, all variables and given/known data
    Determine the specific volume, v (volume per mass[m^3/kg]) of a water steam at a pressure of 100kPa and a temperature of 500 degrees Celsius by assuming an ideal gas (pV = nRT) and by using the van der Waals equation for n moles

    2. Relevant equations
    pv = nRT
    van der waals equation (p + n^2a/V^2)(V-nb) = nRT

    3. The attempt at a solution
    alright I got the first part no problem as i used the molar mass of air to be 18.0g/mol and I got the specific volume to be 3.57 m^3/kg. The second part of the question is confusing me because I have no clue how to solve for the volume for Van der Waals! any help please?
  2. jcsd
  3. Dec 1, 2009 #2
    Re: Solving for volume in Van der Waals Equation??

    well I was able to get Van Der Walls Equation in terms of specific volume:

    (p + a/(v^2M^2)) (v- b/M) = RT/M

    still can't figure out how to solve for v, specific volume???
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