Question

A drop of olive oil of radius 0.30mm spreads into a nearly circular film of radius 12cm on the water surface. Estimate the molecular size of olive oil.​

Answer 1

Here olive oil spread as a film, supposing it is 1 molecule thick on water surface, then the thickness of the film will give the estimate of diameter of molecule

So, we have

d = Volume of oil drop ÷ Area of film

d = 4/3 π (0.03)³ ÷ π (12)²

d = 4/3 (0.000027) ÷ 144

d = 0.000036 ÷ 144

d = 0.00000025

Answer 2

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