The average atomic mass of an element X is 16.2u . What are the percentage of the isotopes 8
16 X and
8
18 X in the sample.
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3
Answer:
Let the percentage of
8
16
X be A %. Then the percentage of
8
18
X be (100−A) %.
∴ 16×
100
A
+18×
100
100−A
=16.2
⟹1800−2A=1620
⟹A=90
So the answer is 90%
8
16
X and 10%
8
18
X
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