How does Avogadro's number relate to atomic mass?

1 Answer
1s2s2p
Apr 25, 2018

The atomic mass tells you have many grams there are per mole of something.

1 mole contains approximately 6.02*10^23 atoms or molecules (depending on what is being talked abotu, whether number of water molecules, atoms of magnesium or total atoms in "NaCl")

So for example, water has a mass of around 18g mol^-1, this means that 18g of water contains 6.02*10^23 water molecules, but 1.806*10^24 atoms (three atoms per water molecule).

Anther example, magnesium has a mass of around 24.3g mol^-1, and 10g contains 10/24.3~~0.412mol of Mg. 0.412(6.02*10^23)~~2.48*10^23 atoms

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