007 amu(a) 15.001 amu(b) 14.000 amu(c) 14.0031 amuThe question was posed to me during a job interview.My enquiry is from Atomic and Molecular Masses in section Chemistry Basic Concepts of Chemistry – Class 11

007 amu(a) 15.001 amu(b) 14.000 amu(c) 14.0031 amuThe question was pos

1.	007 amu(a) 15.001 amu(b) 14.000 amu(c) 14.0031 amuThe question was posed to me during a job interview.My enquiry is from Atomic and Molecular Masses in section Chemistry Basic Concepts of Chemistry – Class 11
Answer» The CORRECT answer is (a) 15.001 amu To ELABORATE: The formula for finding the average atomic mass of an element is given by Avg. Atomic Mass = ∑Abundance of ISOTOPE x Mass of isotope. So for NITROGEN, avg atomic mass = 99.69 x 14.0031 + 0.39% x 15.0001 = 14.007.

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