What is the estimated width of stearic acid molecules in water?

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Estimating the width of stearic acid in water is crucial for experiments determining Avogadro's number. The width of the carboxylic acid group (COOH) is estimated to be around 3 to 4 angstroms. Accurate measurements are essential, as discrepancies in the width estimation can lead to significant errors in calculations. The current experiment yielded a value of 10^24 instead of the expected 10^23, highlighting the importance of precise width estimation for reliable results.
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Hi, can anyone tell me how to estimate width of one stearic acid when it is in water.

/\/\/\/\/\/\/\/\-COOH <- i want the width going up and down.
 
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I'd guess it's not likely to be more than 3 or 4A wide. What kind of accuracy are you looking for ?
 
I'm working on a lab that uses the amount stearic acid that covers an area of water to determine the avogadro's number. So far I've only gotten that are 10^24 instead of 10^23...I think the key is the estimate of the width of the COOH that touches the water.
 

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