Question

A teaspoon of an organic oil dropped on the surface of an immobile pond spreads and covers almost half a hectare, the oil film has a thickness equal to the size of a molecule. if in the laboratory you drop 0.001 milliliters of the organic oil in an immobile surface of water, you will see that it covers 1.0 m2 of its area, if the layer has a molecule of thickness, what is the size of a single molecule?

Answer 1

10^-9 m^3 when spread in one layer occupies an area of 1.0 m^2. You have been given a Volume and an Area. As any middle school student should be able to tell you Volume=Area x Depth therefore Volume/Area= Depth: (10^-9 m^3)/(1.0 m^2)= 10^-9 m or 10 Angstroms tending to indicate that the oil molecules are appx 10 atoms long.
Without knowing the number of molecules in a drop, or any other function of the concentration a cross sectional area of the molecule in indeterminable.
Provided that all the information was copied properly in the original question, this method works. In summary, Volume/Area= Length of Molecule.

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