The average atomic mass number of a sample of an element X is 10.2u. what are the percentages isotopes ¹⁰6X and ¹²6X in the sample ?
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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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