Question

0.01cm³ of oil spreads out on water to form a patch of diameter 28cm. estimate the diameter of an oil molecule ,and express your answer correct to 3s.f.g.

Answer 1

thickness =       volume       
                 area of the patch
Area=πrxr=3.142 x 14 x 14=615.832cm²
Volume=0.01cm³.
t =   0.01   
     615.832     correct to 3s.f