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help! GC topscore question!!!

Discussion in 'DAT Discussions' started by JustwantDDS, Aug 4, 2011.

  1. JustwantDDS

    JustwantDDS DrAMG
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    [​IMG]


    ok- i understand up to finding the 40% of M

    then wth is the rest
    an ICE table i assume.......... can someone explain/show set up please?!?!?!?! my brain hurts:eek:
     
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  3. LetsGo2DSchool

    Removed 2+ Year Member

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    Hey, I just got this problem wrong too a little while ago, but now understand the solution.

    It's an ICE setup:

    Initial:
    PCl5: 4.750 M
    PCl3: 0 M
    Cl2: 0 M

    Change:
    PCl5: -1.896 M
    PCl3: +1.896 M
    Cl2: +1.896 M

    Equilibrium:
    PCl5: 4.750 - 1.896 = 2.854 M
    PCl3: 1.896 M
    Cl2: 1.896 M

    PCl5 <---> PCl3 + Cl2

    Kc = [PCl3][Cl2] / [PCl5]
    Kc = (1.896)(1.896) / 2.854
    Kc = (1.896)^2 / 2.854
     
  4. JustwantDDS

    JustwantDDS DrAMG
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    thank youuuuuuuuuu
    how r we supposed to do this w/o a calc errrrrrrrrrrrrrgh
     

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