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Kinetic energy of gas

  1. Feb 5, 2014 #1
    Two identical bottles contain the same number of molecules at ambiant conditions of temperature and pression.The first contains N2, and the second CO2.Tell if the it's true/false and explain why

    The molecules of CO2 have more kinetic energy than the molecules of N2.

    My answer : False because if we consider the mass of each sort of molecules, we see clearly that a molecule of N2 is 28,02 of mass unit while CO2 is 44,01 mass unit. The latter having a bigger mass, it clearly goes at a lower speed, which results in having less kinetic energy.

    Would this justification be any good ???

    Thank you!
     
  2. jcsd
  3. Feb 6, 2014 #2

    Borek

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    Staff: Mentor

    How is the energy of the molecule related to the temperature?
     
  4. Feb 6, 2014 #3
    Well, if the temparture gets higher the molecules tend to move faster and produces more kinetic energy.Atleast, that's what I understood from reading my things...
     
  5. Feb 7, 2014 #4

    Borek

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    Staff: Mentor

  6. Feb 7, 2014 #5
    I dont know any calculus :/ But is my interpretation any good??
     
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