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Chemistry with a mass question?

  1. Sep 19, 2010 #1
    1. The problem statement, all variables and given/known data

    http://img842.imageshack.us/i/cusersbenappdatalocalte.png/


    2. Relevant equations



    3. The attempt at a solution

    The work is inside the link. I am just wondering how 4.09 grams is obtained? Like how did the person know to take out 4.09 grams?
     
  2. jcsd
  3. Sep 19, 2010 #2

    epenguin

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    Homework Helper
    Gold Member

    Very likely in parts a or b which we can't see.
     
  4. Sep 19, 2010 #3

    Borek

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    Staff: Mentor

    If you are too lazy to copy questions, I am too lazy to think about the answer.
     
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