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Question

The average atomic mass of a sample of an element X is 16.4 u. What are the percentage of isotopes 168X and 188X respectively in the sample?

A
90%, 10%
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B
20%, 80%
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C
90%, 10%
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D
80%, 20%
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Solution

The correct option is D 80%, 20%
Let percentage of 168X be y and of 188X be 100y.
(16×y100)+18×(100y)100=16.4
16y100+180018y100=16.4
2y=160
y=80
Hence, percentage of 168X is 80% and of 188X is 20%.

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