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What is the approximate diameter of an oil molecule? 
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#1
Jun410, 09:49 PM

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 


#2
Jun410, 09:58 PM

HW Helper
P: 4,435

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. 


#3
Jun410, 10:25 PM

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.



#4
Jun410, 10:47 PM

HW Helper
P: 4,435

What is the approximate diameter of an oil molecule?



#5
Jun410, 10:51 PM

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.? 


#6
Jun410, 10:59 PM

HW Helper
P: 4,435

x_{2} = 4.9*2 + 6.06 Continue till i = 4, simplify and add all. 


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