The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu. 
A) 159.4
B) 162.0
C) 163.1
D) 161.5
E) 163.0
Correct Answer:
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E)6
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B)C3H6
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E)C5H10
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