Nitrogen has two isotopes, N-14 and N-15, with atomic masses of 14.00031 amu and 15.001 amu, respectively. What is the percent abundance of N-15?
The percent abundance of N-15 is 0.6403%.
Formula for Calculating Isotope Percent Abundance
In order to determine the percent abundance of nitrogen-15:
Set up the formula for nitrogen-15 and nitrogen-14.
Simplify the left-hand side.
Divide both sides by
In case you're interested, the percent abundance of nitrogen-14 is