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Avogadro's number

Name: Anonymous 2009-12-18 22:09

Why is a mole defined as the number of atoms in 12 grams of carbon-12, rather than the number of atoms in 1 gram of hydrogen?

Name: Anonymous 2009-12-19 10:16

>>4
6.022 141 79(30) × 10^23

How is that a near whole number? You don't even know what the first decimal place is.
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