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 A burette is filled with oleic acid drop upto the 15.5cm3 ark. After 50 drops of the oil were let out of the burette the level of the oil dropped to 22.5cm3.

  1. Determine the volume of one drop of the oleic oil. 
  2. One drop of the oleic oil is carefully introduced onto a clean surface of a trough. It spread to a patch. Determine the thickness of each oleic oil molecules in metres. (Assuming the radius of drop = radius of patch). 
  3. State two assumptions made in part (b) above. 

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  1. 50 drops = 22.5
                  −15.5 
                      7.0
    1 drop = 7.0
                  50   
              = 0.14cm    
  2. Vol of the drop = vol of the patch
    ∴ 4/3πr3 = πr2×t
    But 4/3πr3=0.14
    r3 = 0.14×3
             4π
    F3ET1PP1Physics q14b
    = 0.322 cm
    Hence 0.14 = π x 0.322x t 
    t =    0.14     
         π x 0.3222
    = 0.4298 cm 
  3.   
    1. Oil spread to one molecule thick.  
    2. No evaporation took place. 
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