Mole ConceptHard

Question

An element X has three isotopes X20, X21 and X22. The percentage abundance of X20 is 90% and average atomic mass of the element is 20.18. The percentage abundance of X21 should be

Options

A.2%
B.8%
C.10%
D.0%

Solution

$20.18 = \frac{20 \times 90 + x \times 21 + (10 - x) \times 22}{100} \Rightarrow x = 2$

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