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Nitrogen has an average atomic mass of 14.00674. It has two isotopes, N-14 and N-15, with atomic masses of 14.0031 amu and 15.001 amu, respectively.

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Nitrogen has an average atomic mass of 14.00674. It has two isotopes, N-14 and N-15, with atomic masses of 14.0031 amu and 15.001 amu, respectively. What is the abundance of N-15? 0.64% 0.42% 0.57% 0.36%

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