A specially prepared sample of nitrogen contains 30% ¹⁴N (mass = 14.00 u) and 70% ¹⁵N (mass = 15.00 u). What is the atomic mass of the nitrogen in this sample?

Question

Quizplus · Accepted Answer

The atomic mass of nitrogen in this sample can be calculated by taking the weighted average of the isotopes based on their abundance. This is done by multiplying the mass of each isotope by its relative abundance (as a decimal), then adding these values together. For nitrogen-14 (mass = 14.00 u) with a 30% abundance, and nitrogen-15 (mass = 15.00 u) with a 70% abundance, the calculation is as follows: (0.30 * 14.00) + (0.70 * 15.00) = 4.2 + 10.5 = 14.7 u.

A Specially Prepared Sample of Nitrogen Contains 30% 14N (Mass

A Specially Prepared Sample of Nitrogen Contains 30% ¹⁴N (Mass