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Homework Help: Mole concept !

  1. Sep 26, 2011 #1
    1. The problem statement, all variables and given/known data
    if 20.0 g of dihydrogen is reacted with 20.0 g of dioxygen , how many grams of water is produced?


    2. Relevant equations



    3. The attempt at a solution
    balancing
    2H2 + O2 = 2H20
    now 2 mole h2 gives 2mole H2O
    so 20/2 moles of H2 will give 10 moles H2O
    10 x 18 = 180 g
    ............
    am i right?
     
  2. jcsd
  3. Sep 26, 2011 #2

    Borek

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    Staff: Mentor

    You start with 20g + 20g = 40g of reactants, is it possible to produce 180g of water?
     
  4. Sep 26, 2011 #3
    the nhow do i do it?
     
  5. Sep 26, 2011 #4

    Borek

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    Staff: Mentor

    What if you start calculations with oxygen?
     
  6. Sep 26, 2011 #5
    Start by finding out the limiting reagent. :)
     
  7. Sep 26, 2011 #6

    Borek

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    Staff: Mentor

    Sigh. I did my best to not use this term as a hint.
     
  8. Sep 26, 2011 #7
    Sorry Borek. :)
     
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