The element X has three naturally occurring isotopes. Themasses (amu) and % abun

Question

The element X has three naturally occurring isotopes. Themasses (amu) and %
abundances of the isotopes are given in the table below. Theaverage atomic mass of the
element is _____________ amu.

Isotope                             Abundance(%)               Mass(amu)

15X                                   28.6                               15.33
17X                                   13.3                               17.26
16X                                   58.1                               18.11

A. 17.20     B. 16.90   C.17.65 D. 17.11

Explanation / Answer

28.6% x 15.66 + 13.3% x 17.26 + 58.1% x 18.11=17.20

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