1.

10 drops of an oleic acid solution of concentration `1/400 cm^3` per `cm^3` of alcohol, are dropped on a water surface. The circular film thus produced has radius 10 cm. Find the molecular size of oleic acid, if the radius of each drop is 1.4 mm.

Answer» `t="nV"/"400A"` or `9.15xx10^(-9)` m


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