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Homework Help: How to find mass given pressure and temperature

  1. Feb 13, 2017 #1
    1. The problem statement, all variables and given/known data
    A 3-m3 rigid vessel contains steam at 10 MPa and 500 degC. The mass of the steam is?

    I know this question involves using a thermo-table, I'm just very confused on how to find mass from the given information.

    2. Relevant equations
    Maybe PV=nRT

    3. The attempt at a solution
    I guessed at the fact that the steam is superheated water, so from there I looked up the pressure table for exactly that. From the given 10MPa, I found that the specific volume at 500 degC is 0.032811 m^3/kg. I'm lost on how to get a mass from this. My only guess is to use a total volume, V, and divide V by the specific volume, v. [ V/v ]
  2. jcsd
  3. Feb 13, 2017 #2
    I solved it. Apparently 3-m3 means a Volume of 3 m^3. From there I divided V/v = 3/0.032811 = 91 kg.
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