Chemistry- A Vogadro

Feb 3rd, 2012
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Cornell University
Course: chemistry
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Avogadro's number by observations of brownian motion. Cannizarro later used Avogadro's hypothesis to develop a set of atomic weights based on 116 of the weight of oxygen. This was a basis for finding much more accurate estimates for Avogadro's number. Reasonable values were made in the late 1800's from sedimentation equilibrium of colloidal particles. Millikan's oil drop experiment in the 1900's gave even more accuracy and was cited in most chemistry text books 50 years ago. Text books in 1958 gave Avogadro's number as 6.02 x10 to the 23rd.

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