What is the average atomic mass for neon?

Question

Neon-20 has a mass of 19.9924 amu
Neon-21 has a mass of 20.9940 amu
Neon-22 has a mass of 21.9914 amu

The relative abundance of 20Ne is 90.92% and 21 Ne is .257% and 22 Ne is 8.82%.

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Answer 1 · 2016-08-14T07:07:27

This is simply the weighted average of the individual isotopes, which gives #20.1797*"amu"#

#Ne_"Average atomic mass"# #=# #(19.9924xx90.92%+20.9940xx0.257%+21.9914xx8.82%)*"amu"# #=# #??"amu"#