Avogadro’s Number, The Mole

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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Avogadro’s Number, The Mole

Postby madawy » Sun Oct 06, 2019 6:20 pm

Does anyone know why they based the mole off of Carbons AMU? Why wouldn’t they rather use a standard whole number?

Marty Hockey
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Re: Avogadro’s Number, The Mole

Postby Marty Hockey » Sun Oct 06, 2019 7:50 pm

Before the 1960s, the standard of measurement for a mole was based on Oxygen. Developments in mass spectrometry allowed scientists to find the number of atoms in 12 grams of carbon. In 2018 at a science conference in France they decided that one mole of a substance would be redefined as "6.022 x 10^23 elementary entities" of that substance.

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