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Homework Help: Thermodynamics for P Chem NEEd HELP By tomorrow

  1. Apr 14, 2010 #1
    Thermodynamics for P Chem NEEd HELP By tomorrow!!!

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

    What are the values of the entropy changes (system, surroundings, and universe) for the cooling of 1 mol of O2 (g) from 298 K to O2 (l) at 90.19 K if the process is done

    a. Reversibly
    b. Irreversibly

    by placing the sample in liquid hydrogen at 13.96 K? Assume enthalpy change of vaporization is 6820 j/mol at 90.19 K and Cp = 7/2 R for the gas.

    2. Relevant equations

    How do you solve this problem for all types of entropy?(entropy changes (system, surroundings, and universe)


    3. The attempt at a solution
    Have no clue how to start it. Please help!!!!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 14, 2010 #2

    turbo

    User Avatar
    Gold Member

    Re: Thermodynamics for P Chem NEEd HELP By tomorrow!!!

    Welcome. Please use this resource wisely. Posts that specify that you need help in the next 24 hours or shorter are probably not going to encourage many members to help you. If you let your problem get that urgent, the motivation to help you will be minimal.
     
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