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Homework Help: Does this look right? co2 question

  1. Nov 21, 2013 #1
    1. The problem statement, all variables and given/known data

    calculate the amount of carbon monoxide necessary to form 100 g of carbon dioxide.

    3. The attempt at a solution

    2CO + O2 -> 2CO2

    Oxygen atom mass ≈ 16μ
    Carbon atom mass ≈ 12μ

    There are 2 carbom atoms and 1 oxygen atom

    100/16+24 = 2.5

    2.5(16+12) = 70g

    Answer: You need 70g CO2 to form 100g carbon dioxide.

    Is this right? I've done some research in Swedish on similar problems and pretty much copy pasted the method. If this is right could someone please write what formula this is?
  2. jcsd
  3. Nov 21, 2013 #2


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    Staff: Mentor

    Chances are it would be right if not for the fact you messed up your math. CO2 is not an oxygen plus two carbon atoms.
  4. Nov 21, 2013 #3
    Is it two oxygen + 1 carbon? :P
  5. Nov 21, 2013 #4


    User Avatar

    Staff: Mentor

    Yep. Take a look at the formula, or the name.
  6. Nov 21, 2013 #5
    32 + 12 = 48

    100/48 = 2.083
    2.083(16+12?) = 58.324g

    If this is correct why is it 16+12 in the "( )"? I do not yet understand this formula obviously. I know that 16+12 is the atom masses for oxygen and carbon together but why would this be in the formula?
  7. Nov 21, 2013 #6
    Ye firstly I figured it was two oxygen + 1 carbon but another person who apparently "knew" chemistry at a website in swedish wrote it out like that so I figured he were more likely to be right than me. Apperently he was wrong.
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