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Homework Help: Unsolved Past Year Question

  1. Sep 23, 2006 #1
    One mole of liquid water occupies a volume of 18 cm3. Imagine that each molecule on the average is at the centre of a small cube. (i) What is the length of the sides of this small cube? (ii) Compare this length with the diameter of a molecule.
  2. jcsd
  3. Sep 23, 2006 #2


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    1 gram-mole of water has a mass of approximately 18 g, and since water has a density of approximately 1 g/cm3, it has a volume of cm3. How many molecules are in a mole? Knowing that, one can detemine the volume per molecule. One should be able to find the side length from the volume of a cube.
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