Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu,92.23% abundance) ,X-29 (28.976 amu,4.67% abundance) ,and X-30 (29.974 amu,3.10% abundance) .Calculate the atomic weight of X.
A) 28.09 amu
B) 48.63 amu
C) 27.16 amu
D) 28.97 amu
E) 86.93 amu
Correct Answer:
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