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A few chemistry questions basically proportion calculations

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

    Chloroethane, reacts with Oxygen according to the equation below:
    2C2H3Cl + 5O2 → 4CO2 + 2H2O
    +2HCl
    How many moles of CO2 are produced when 3.0 moles of choloroethane and 3 mol of O2 are reacted?


    When 50cm3 of 1mol/dm3 HCl is mixed with 50cm3 of 1mol/dm3 NaOH, the temp of the resulting solution increases by 6 °C. What will be the temp change when 100cm3 of each of these solutions are mixed?





    I'm sorry I don't really have any idea on how to attempt these properly, could you guys give me a hint? Please!!! The help would be greatly appreciated !!
     
  2. jcsd
  3. Jan 21, 2013 #2

    Borek

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    Staff: Mentor

  4. Jan 21, 2013 #3
    So for the first one it is 5mole of Oxygen gives 4 mole of CO2? so
    3mole of Oxygen gives X moles?
     
  5. Jan 21, 2013 #4

    Borek

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    Yes, but you have to check if there is enough chloroethane to react with 3 moles of oxygen. Could be there is not enough, then you will have to calculate amount of CO2 knowing that 2 moles of chloroethane produce 4 moles of carbon dioxide.

    This is so called limiting reagent problem.
     
  6. Jan 21, 2013 #5
    So is it 2 moles of chloroethane react with to produce 4 mole of carbon dioxide
    so 3moles gives x?
     
  7. Jan 21, 2013 #6

    Borek

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    Staff: Mentor

    Yes.
     
  8. Jan 21, 2013 #7
    So the overall answer is 6moles of CO2?
     
  9. Jan 21, 2013 #8

    Borek

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    Staff: Mentor

    How many moles of CO2 would be produced from 3 moles of O2?
     
  10. Jan 21, 2013 #9
    2.4moles
     
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