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Work done by cyclic process (thermodynamics)

  1. Aug 31, 2012 #1
    1. The problem statement, all variables and given/known data
    http://s9.postimage.org/5iw5rixyl/image.jpg
    (sorry doesn't let me embed)

    2. Relevant equations
    P1V1=P2V2
    and
    PV=nRT

    I know that Work done by gas from a --> b = (nRT)*Integral(V2/V1)
    My question is do i use PV=nRT to find N? and if T is constant (isothermal) what do I plug in for T when evaluating work?

    Using PV=nRT I got n= 14.440 when T=constant (1), is this correct?

    I appreciate all of your help.
     
    Last edited: Aug 31, 2012
  2. jcsd
  3. Aug 31, 2012 #2
    bump. i really need help.
     
  4. Sep 1, 2012 #3
    n is constant so you shouldn't need to worry about it.
    (PV)/(nRT)=1 for both "a" and "b" so we can set them equal since they both equal 1.
    => P_f*V_f = P_i*V_i
    Now you can solve for P_f since everything else is given.
    At this point you can integrate from each initial to final (remember to set your integrals limits in the correct order). The total work is the sum of the individual work done on/by the system.
     
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