You can obtain a rough estimate of the size of a molecule by the following simpl

Engineering
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You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a droplet of oil spread out on a smooth surface of water. The resulting oil slick will be approximately one molecule thick. Given an oil droplet of mass 8.0 10-7 kg and density 834 kg/m3 that spreads out into a circle of radius 41.8 cm on the water surface, what is the order of magnitude of the diameter of an oil molecule?

May 27th, 2015

:................

I'm sending the answer

May 27th, 2015

Density = mass/volume

Volume= mass/density

             = 8.0x10^-7/834

              = 9.592x10^-10

Assume cylinder

May 27th, 2015

Volume of a cylinder =ba*h

H will be diameter of molecule

So diameter = volume/ba

                    = 9.592 x 10^-10/(3.142*0.418^2)

                    = 1.7x10^9 m


Answer...found.

Thanks

May 27th, 2015

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