Q. What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu?
A. 65.3 amu
B. 64.4 amu
C. 64.9 amu
D. 65.0 amu
Answer: 65.0 amu
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