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  1. RoseChm05E

    Thermodynamics differentiation?

    If we have a correction term to be added to the excess Gibbs energy of mixing for UNIQUAC as follows, how do we get to the correction of the activity coefficient? GE,HB/RT = sum(xi[-2ln(1+ ai*F)+(aiF/(1+aiF)) - Ci,pure]) where F = sum(xj*aj/(1+aj*F)) Yes, F looks like it is circularly...
  2. RoseChm05E

    Thermo help

    Hey, I got it along with a full answer key, thanks guys.
  3. RoseChm05E

    Reactor performance question

    In a reversible reaction in a PBR with stoichiometry A <-> B (these have the same physical properties) and low conversion, a catalyst size change of +/- 15% doesn't change conversion. We need to find how this lack of conversion be changed (if at all,) how can conversion be increased (besides...
  4. RoseChm05E

    Thermo help

    Thanks for the help...it only asks for the amount of work and not steam rate but that'd be simple enough if I had to get it.
  5. RoseChm05E

    Thermo help

    "Find the superheated steam properties at 4.0 MPa and Sv=8.416 kJ/(kg.K) by use of tables or a Mollier diagram, and then apply the formula for machine efficiency" Yeah, that's what I did, I was confused because the section included steam quality calculations, but for the superheated steam...
  6. RoseChm05E

    Thermo help

    Yes, I have that definition in front of me, too. Am I supposed to match the 8.146 entropy with the same value by interpolating between 700 and 750 C on my 4.0 MPa value to get 739C superheated steam, then interpolate on enthalpies the same way and take the difference, then multiply that by 0.85?
  7. RoseChm05E

    Thermo help

    I just went back to graduate school and am lost on these problems. If an 85% efficient adiabatic steam turbine's inlet is 4.00 MPa and the outlet is 0.01 MPa, how do you find the superheat required on the inlet, and the work produced by the turbine? I have my Sv = 8.146 kJ/kg-K, T = 45.8C and...

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