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Homework Help: Distance between water molecules.

  1. Nov 1, 2009 #1
    1. The problem statement, all variables and given/known data
    There are 3.344 x 10^25 molecules in 1 kg (1 litre) of water. What is the distance between the molecules?

    2. Relevant equations

    3. The attempt at a solution
    I found the density of water in kg/m^3, then found # moles in 1 litre (55.6) and then from that using Na I found the # of molecules. Im unsure of where to go next with finding the distance betwee them.
  2. jcsd
  3. Nov 2, 2009 #2


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    Homework Helper

    Assume that all molecules occupy identical cubic cells. (They vibrate, rotate, do Brown motion, so this volume is not the same as their actual size) How much volume does a molecule own? Imagine that each molecule occupies the centre of a its own cell. What is the length of one side of a cube and what is the distance between the neighbouring centre?

  4. Nov 2, 2009 #3


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    Staff: Mentor

    Last edited by a moderator: Aug 13, 2013
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