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Amount of moles emitted by burning oil

  1. Apr 3, 2014 #1
    1. The problem statement, all variables and given/known data

    Calculate the number of moles of CO2 that are emitted into the atmosphere per year due to the total energy consumption on earth (16TW). Note: 1kg oil yields 42MJ and for oil C:H ' 1:2.

    I don't know how to calculate how many grams/moles of CO2 are emitted by burning 1kg of the oil

    2. Relevant equations




    3. The attempt at a solution

    - 1 mole CO2 is 44g

    - I calculated that 1,22x10^13 kg oil is needed to cover the 16TW
     
  2. jcsd
  3. Apr 3, 2014 #2
    The problem approximates the formula for oil as a chain of CH2s. Each CH2 reacts with O2 to produce H2O and CO2. Can you write a balanced reaction equation for the reaction of each CH2 group with O2?
     
  4. Apr 3, 2014 #3

    Borek

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    Staff: Mentor

    Or, from a slightly different (but yielding the same answer) angle: if the experimental formula is CH2, how many grams of C and how many grams of H in 1 kg of the substance?
     
  5. Apr 3, 2014 #4
    Thank you so much for your input!

    Let's check if I understand it better now:

    2CH2+ 3O2 gives 2H2O + 2CO2

    So 2 mol oil gives 2 mol CO2

    1 mol oil weights 14g
    1 mol CO2 weights 44g
    1.22 x 1013 kg oil/ 14 x 10-3 = 871x106mol oil
    Which equals the amount of moles CO2

    Is this correct?
     
  6. Apr 3, 2014 #5

    Borek

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    Staff: Mentor

    Chemistry looks OK to me, but on the second read I am not sure how to understand

    16TW is not energy consumption, it is power required. I see you assumed it is intended to mean "average power required throughout the year" - looks OK to me, still, question could be worded better.
     
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