Question

An element consists of three isotopes. The abundance of one isotope is 92.21% and its atomic mass is 27.97693 u. The abundance of the second isotope is 4.70% and its atomic mass is 28.97649 u. The atomic mass of the third isotope is 29.97376 u. What is the average atomic mass of the element?
A.28.09 u
B.28.98 u
C.28.96 u
D.29.87 u
E.29.07 u

Answer

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