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Alex17521 [72]
3 years ago
12

HELP: Nitrogen has two isotopes, N-14 and N-15, with atomic masses of 14.00031 amu and 15.001 amu, respectively. What is the per

cent abundance of N-15?
Chemistry
1 answer:
vitfil [10]3 years ago
6 0
The atomic mass<span> of an element is a weighted average of its </span>isotopes<span> in which the sum of the abundance of each isotope is equal to 1 or 100%.

</span><span>Let fraction of N-15 be x
then fraction of N-14 = 1-x 
</span>
<span>Formula for Calculating Isotope:
</span>
15.001x + 14.00031(1-x) = 14.0067

on calculation:

x = <span>0.006403
so, % = 0.006403 x 100  =  0.6403 %<span>
</span></span>
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