1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Finding number density and average distance between molecules

  1. Dec 2, 2011 #1
    1. The problem statement, all variables and given/known data

    At 0.0° C and 1.00 atm, 0.95 mol of a gas occupies a volume of 0.0213 m3.

    (b) Estimate the average distance between the gas molecules.
    Last edited: Dec 2, 2011
  2. jcsd
  3. Dec 2, 2011 #2
    Do you know that 1 mole means 6.02 x 10^23 particles?
    You have 0.95 moles so can you see how to calculate the 'number density' i.e the number of particles per m^3
  4. Dec 2, 2011 #3
    so divide the 6.02e23 by .95?
  5. Dec 2, 2011 #4
    Not divide by 0.95. You have 0.95 OF 1 mole
  6. Dec 2, 2011 #5
    ohh multiply them and then do the same thing as I did before.
  7. Dec 2, 2011 #6
    see what you get
  8. Dec 2, 2011 #7
    6.02e23*.95*1*272/.0213= 7.3e27
  9. Dec 2, 2011 #8
    you are being blinded by equations !!! You have the number of molecules correct and you have the volume.... that is all you need to get the 'number density'
    The pressure and temperature are not needed for this part.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook