Problem: There are two isotopes of the element gallium that appear in nature, 69Ga (M = 68.926 amu) and 71Ga (M = 70.924 amu). Given that the average atomic mass for gallium is M = 69.72 amu, what is the percent by number of the 69Ga isotope in naturally occurring gallium?A. 39.7%B. 97.0%C. 50.0%D. 60.3%E. 98.9%

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There are two isotopes of the element gallium that appear in nature, 69Ga (M = 68.926 amu) and 71Ga (M = 70.924 amu). Given that the average atomic mass for gallium is M = 69.72 amu, what is the percent by number of the 69Ga isotope in naturally occurring gallium?

A. 39.7%
B. 97.0%
C. 50.0%
D. 60.3%
E. 98.9%