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Nitrogen(N) is made up of 99.632% 14N and 0.368% 15N.
The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu.
What is the average atomic mass of nitrogen?

14.0 amu
14.006 amu
15.00 amu
15.50 amu