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Homework Help: Approximatly 5% of each exhaled breath is carbon dioxide

  1. Dec 8, 2009 #1
    1. The problem statement, all variables and given/known data

    In normal breathing conditions approximatly 5% of each exhaled breath is carbon dioxide. Given this informartion and neglecting any difference in water-vapor content estimate the typical difference in mass between an inhaled breath and an exhaled breath. assume one lungs capacity is about half a litre and that 20 % of the air that is breathed in is oxygen.

    2. Relevant equations


    3. The attempt at a solution

    not really sure where to start for this one
  2. jcsd
  3. Dec 8, 2009 #2


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    Re: Breathing

    It tells you how much oxygen is breathed in on each breath
    5% of the total amount of air is turned into CO2
    So work out how much oxygen is turned into CO2

    Then we can work out how much this volume of O2 and CO2 weigh
  4. Dec 8, 2009 #3
    Re: Breathing

    How do you work out how much the volume of these gases weigh? Would you need to look up extra information such as molar mass of 02 and C02?
  5. Dec 8, 2009 #4
    Re: Breathing

    1/4 of the O2 is turned into CO2 and i'm not sure what i have to do now?
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