Question

calculate the average atomic mass for neon if its abundance in nature is 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22

Answer 1

The average atomic mass of Neon would simply be the sum of the weighted average of each isotope. That is:

average atomic mass = 0.905 * 20 + 0.003 * 21 + 0.092 * 22

average atomic mass = 20.187 amu 

Answer 2

Answer: 20.187 amu

Explanation:

20(0.905)+21(0.003)+22(0.092)