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Topic: Unusual Questions Asked at Chemistry Qualifying Exams (PhD candidacy)  (Read 15943 times)

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ChrisHarding

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Re: Unusual Questions Asked at Chemistry Qualifying Exams (PhD candidacy)
« Reply #15 on: October 25, 2014, 04:22:31 AM »
Knowing Avogadro's number explain why the sky is blue.


Hello,

The question regarding Avogadro's number and the blue sky is actually a fairly famous question from Physical Chemistry.

If I remember correctly, it is an approximation that has to do with the relationship to mole, Standard Temperature and Pressure (STP), the fact that one mole of gas occupies a 22.4 liters at STP, and the distance between the gas molecules as related to wavelength and scattering. A back calculation is pe

As a chemical engineering student taking physical chemistry, this was one question on a test of mine at Oregon State University. If I remember correctly, our question was actually: "By the knowledge that the sky is blue, derive Avogrado's number."

I know this post is old, but I thought I would add my two cents. Actually, I only have a cent now.
 

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