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Unformatted text preview: 1 mole ≡ the number of atoms in 12 g of 12 C. 1 u ≡ onetwelfth of the mass of one 12 C atom. From the second definition, we conclude that the mass of one 12 C atom is 12 u. Assuming that we have counted the number of 12 C atoms in 12 g of 12 C (it can be done by various techniques), and that this has in fact established that 1 mole = 6.022 x 10 23 particles, we have: # g u = 12 g 12 C 1 mole 12 C " # $ % & ’ 1 mole 12 C 6.022 x 10 23 12 C " # $ % & ’ 1 12 C 12 u " # $ % & ’ # g u = 1 6.022 x 10 23 " # $ % & ’ = 1.661 x 10 ( 24 g u = 1.661 x 10 ( 27 kg u All of this information is in the textbook and the slides but not explicitly written out....
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This note was uploaded on 11/02/2009 for the course CHEM C1403 taught by Professor Parkin during the Spring '08 term at Columbia.
 Spring '08
 Parkin
 Chemistry

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