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Chemical equations

  1. Feb 15, 2004 #1
    4CO + 2CO2 -> 4CO2 this is Balanced

    when I simplify, the simplification doesn't work

    2CO + O2 -> 2CO2

    3 moles of O2 does not equal 4 Moles of O2

    where's my error????
  2. jcsd
  3. Feb 15, 2004 #2


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    I assume your initial reaction was supposed to be:
    4CO + 2O2 -> 4CO2 otherwise it didn't start out balanced

    In the simplified form, the error is you're mixing up O and O2. Just count O and you get this:
    Left side
    2 CO = 2C + 2O
    1 O2 = 0C + 2O
    Total= 2C + 4O

    Right side
    2 CO2 = 2C + 4O which is the same as the total for the left side.
  4. Feb 15, 2004 #3

    actually this is the reaction I meant

    CO + O2 -> CO2 (Unbalanced)

    sorry it was a mistake originally
    Last edited: Feb 15, 2004
  5. Feb 17, 2004 #4


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    Re: RE

    Okay, then look carefully at the original equation.

    4CO + 2O2 -> 4CO2

    To simplify the equation, you divide by two. This gives you:
    2CO + O2 -> 2CO2
    This is what you had in your first post as the solution, and it was a correctly balanced equation. You can't simplify any further since you're already down to just one O2 on the left side of the equation. The unbalanced equation you're having trouble with doesn't take into account dividing 1 O2 by 2, which would give you 1/2 O2. This wouldn't be wrong, but it's not any simpler when you start adding fractions, so you stop simplifying before you get to fractions.
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