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Homework Help: Ideal gas law to find volume

  1. Nov 13, 2007 #1
    Consider an ideal gas at 27.0 degrees Celsius and 1.00 atmosphere pressure. Imagine the molecules to be uniformly spaced, with each molecule at the center of a small cube.

    What is the length L of an edge of each small cube if adjacent cubes touch but don't overlap?
    I know that the ideal gas law states V=nRT/p and that in this case R=8.2057(10^-5) m^3 (atm/mol*K), p=1atm, T=27+273K. What is n???? I can't solve without n!
  2. jcsd
  3. Nov 13, 2007 #2


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    Simply plug and chug.

    You may be forgetting to convert 27 centigrade to an absolute temperature scale such as kelvin.

    Never mind that; I didn't see the second part of your post.

    As for n, think about how many atoms you are finding the "cube" for.
    Last edited: Nov 13, 2007
  4. Nov 13, 2007 #3
    am i approaching it the wrong way?
  5. Nov 13, 2007 #4


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    No you are approaching it the right way.

    Think about n. How many moles is one particle?
  6. Nov 13, 2007 #5
    are you looking for 6.02*10^23 as the answer to your ^ question? sorry don't get it even if that's what you're looking for
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