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Question

The average atomic mass of a sample of an element X is 16.2u. What are the parcentage of isotopes 168X and 188X in the sample?

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Solution

Given
Average atomic mass =16.2u.
Let, % of 168X=a;% of188X=(100a)
Average atomic mass is generally calculated using the formula,
A1×x100+A2×Y100
Where,
A1,A2Atomic masses
X,YRespective percentages
using the given data,
16.2=16×a100+18×100a100
1620=18002a
a=90%(168X)
100a=10%(188X)

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