Chemistry
Grade-9
Easy
Question
Calculate the average atomic mass of nitrogen isotope (14N and 15N) present in the atmosphere?
- 15.99 amu
- 14.007 amu
- 14.001amu
- 14.001amu
Hint:
The average atomic mass of nitrogen isotope is the percentage present multiplies by that atomic mass of all the isotopes added.
The correct answer is: 14.007 amu
The average atomic mass of nitrogen isotope is the percentage present multiplies by that atomic mass of all the isotopes added.
The two isotopes of Nitrogen are 14N and 15N. 14N is present in 99.6% and 15N is present in 0.4%.
The average mass = (.996
14 + 0.00415) 
2 = 14.004 amu. The closest option is 14.007 amu.
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