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.

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Calculate the volume of one drop of oleic acid solution.
The formula for the volume \( V \) of a sphere is given by:

\[ V = \frac{4}{3} \pi r^3 \]
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