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Percentage Yeild - check answer?

  1. Sep 19, 2008 #1

    a.a

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    1. The problem statement, all variables and given/known data
    The direct reaction of silicon with Cl_2 the yield of SiCl4 is 50%. How many grams of SiCl4 are obtained in the reaction of 2.8 g of silicon with excess chlorine?


    2. Relevant equations
    Si= 28.0855g
    SiCl4= 169.8963g
    Si + 2Cl2 --> SiCl4


    3. The attempt at a solution
    2.8g Si = (84.94815 g SiCl4/28.0855 g Si)* 2.8g Si
    = 8.468 g SiCl4
    = 8.5 SiCl4

    Could someone please let me know if I made any mistakes?
     
  2. jcsd
  3. Sep 19, 2008 #2

    Borek

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    Staff: Mentor

    This is obviously wrong - perhaps just what you wrote is wrong, as the final number looks OK. But for sure 2.8 g Si doesn't equal 8.468 g SiCl4.

    However - where is the yield percentage used? Have you forgot?
     
  4. Sep 19, 2008 #3

    a.a

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    sorri, the way i wrote is is wrong, i ment to say that 2.8 Si produces 8.468 g SiCl_4
    i used the percentage yeild in that i said 84.94815 g SiCl4 rather than 169.8963g
     
  5. Sep 19, 2008 #4

    Borek

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    Staff: Mentor

    Use precentage as the last step, after you calculate correct stoichiometric amount. Numbers look OK.
     
  6. Sep 19, 2008 #5

    a.a

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    do we still arive at the same answer though?
     
  7. Sep 19, 2008 #6

    Borek

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    Staff: Mentor

    Yes. That's why I wrote that numbers look OK.
     
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