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Question
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes
Solution
It is given that the average atomic mass of the sample of element X is 16.2 u.
Therefore,
The atomic mass of the given element X is = 16.2 u.
Let
Then
Average mass of X =
16.2 =
1620 = 1800 − 2a
1800 - 1620 = 2a
180 = 2a
a =
a = 90
Therefore
And
= 10%
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