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A small drop of oil has a volume of 5 x 10-8m3. When it is put on a surface of some clean water, it forms a circular film of 0.1m2 in area.

  1. What is the size of a molecule of oil 
  2. State 2 assumptions you made in your calculations

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  1. Volume of drop = 5 x 10-8 m3
    Area of circular film = 0.1m2
    V = A x H
    h=VA 
    Size of molecule=5 x 10-8m/20.1m2
    =5.0 x 10-7m
  2.    
    • Atoms are spherical 
    • Mass uniformly distributes 
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