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Homework Help: Molecules in a vacuum

  1. Feb 19, 2008 #1

    bse

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    How many molecules exist in one cubic centimeter of space at a pressure of 10^-15 atm and temperature of 20 degrees C?
     
  2. jcsd
  3. Feb 19, 2008 #2

    mgb_phys

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    Homework Helper

    PV = nRT
    Where P pressure, V volume, T absolute temperature, n number of moles and R is a constant
    You can find the units and value of R in the tetbook or wiki.
     
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