# what is the approximate diameter of an oil molecule?

by xxcherry06xx
Tags: approximate, diameter, molecule
 P: 3 You can obtain a rough estimate of the size of a molecule with the following simple experiment: Let a droplet of oil spread out on a fairly large but smooth water surface. The resulting ”oil slick” that forms on the surface of the water will be approximately one molecule thick. Given an oil droplet with a mass of 8.85 × 10^−7 kg and a density of 923 kg/m3 that spreads out to form a circle with a radius of 43.2 cm on the water surface, what is the approximate diameter of an oil molecule? Answer in units of m. 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution
 HW Helper P: 4,436 Hi xxcherry06xx, welcome to PF. Volume = mass / density. π*r^2*d = mass/density, where d is the diameter of the molecule. Substitute the values and find d.
 P: 3 I tried that but I still can't get the right answer. I keep getting 0.000000002 but it's saying it's not right on my homework.
HW Helper
P: 4,436

## what is the approximate diameter of an oil molecule?

 Quote by xxcherry06xx I tried that but I still can't get the right answer. I keep getting 0.000000002 but it's saying it's not right on my homework.
I am getting 1.635x10-9m.
 P: 3 Okay I will try it thank you!! I have one more question for you... it is a picture because i don't know how to type it html style but the link is.. http://yfrog.com/jv42157278p I assumed it was the sum of xi = 4.9 i + 6.06 where i =1 then take that answer and ^4. I don't know what else that equation can mean? Can you please help.?
HW Helper
P: 4,436
 Quote by xxcherry06xx Okay I will try it thank you!! I have one more question for you... it is a picture because i don't know how to type it html style but the link is.. http://yfrog.com/jv42157278p I assumed it was the sum of xi = 4.9 i + 6.06 where i =1 then take that answer and ^4. I don't know what else that equation can mean? Can you please help.?
x1 = 4.9*1 + 6.06

x2 = 4.9*2 + 6.06

Continue till i = 4, simplify and add all.

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