The Average Atomic Mass of Zinc Is 65 A) 2783%
B) 0

Multiple Choice

The average atomic mass of zinc is 65.39 amu. Given the data in the following table, what is the natural abundance of ⁶⁶Zn? $$\begin{array} { c c c } \text { Isotope } & \text { Mass (amu) } & \text { Natural Abundance (\%) } \\{ } ^ { 64 } \mathrm { Zn } & 63.9291 & 48.89 \\{ } ^ { 66 } \mathrm { Zn } & 65.9260 & ? \\{ } ^ { 67 } \mathrm { Zn } & 66.9271 & 4.11 \\{ } ^ { 68 } \mathrm { Zn } & 67.9249 & 18.56 \\{ } ^ { 70 } \mathrm { Zn } & 69.9253 & 0.62\end{array}$$

A) 27.83%
B) 0.2783%
C) 50.00%
D) 2.783%
E) 28.73%