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Gas: calculating pressure

  1. Mar 3, 2015 #1
    1. The problem statement, all variables and given/known data
    Tums react in your stomach to produce a gas. The average adult stomach expand to one liter when full. Calculate the pressure in the average adult stomach after taking 2 Tums.
    2. Relevant equations
    Since its asking for pressure, and the volume is given perhaps PV=nRT should be used.
    Also P1V1=P2V2 might seem like a possible equation.


    3. The attempt at a solution
    I'm honestly not sure how to start this problem. I started with a balanced chemical equation for the reaction of the Tums (CaCO3) and the stomach acid/hydrochloric acid (HCl), which would be:
    CaCO3 + 2HCl --> CaCl2 + H2O + CO2. I'm not sure where to go from here or if this is a necessary step in solving the problem. Any suggestions in where to start would be helpful.
     
  2. jcsd
  3. Mar 3, 2015 #2

    mfb

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    What is the weight of a "tum"?
    How much CO2 do you get from the reaction? (In any unit you like)
     
  4. Mar 3, 2015 #3
    One tums tablet is 250 mg. So two tums tablets would be 500 mg or .5 grams. If so, then would .0049 moles of CO2 sound correct?
     
    Last edited: Mar 3, 2015
  5. Mar 3, 2015 #4

    Borek

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    Yes.

    What is a body temperature?
     
  6. Mar 3, 2015 #5
    37 degrees Celsius. Converted to kelvins it would be 310.15 K. Would I use this as the temperature in the equation PV=nRT?
     
  7. Mar 3, 2015 #6

    mfb

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    Staff: Mentor

    Sure. I think everything apart from pressure is known now.
     
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