The fictional element kryptonite (lets give it the symbol Kt) associated with Superman's home planet of Krypton could be said to consist of two isotopes with the following abundances. Estimate the approximate atomic mass of kryptonite.
Kt 285; 70.0%
Kt 289; 30.0%
a. 288.2 amu
b. 286.2 amu
c. 284,6 amu
d. 282.6 amu
e. 280.3 amu
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