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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