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Given a solution of 5.0% by volume oleic acid in alcohol: Two drops (100 drops /cm^3)...

Given a solution of 5.0% by volume oleic acid in alcohol: Two drops (100 drops /cm^3) are placed on a water surface and a continuous, circular film is formed 16.0 cm in diameter after all the alcohol has evaporated and the oil is distributed evenly on the surface. What would be the thickness of the layer of pure oil?
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