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Isotopes and Isobars

Atomic mass o...

Question

Atomic mass of chlorine is 35.5. It has two isotopes of atomic mass 35 and 37. The percentage of heavier isotope is:

A

10

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B

15

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C

20

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D

25

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Solution

The correct option is D 25
Let percentage of heavier isotope be x. Thus $35.5 \times 100 = 37 \times x + 35 (100 - x)$

$\Rightarrow x = 25$ %

Hence answer is option D

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Q. Chlorine has two naturally occuring isotopes

_{17}^{37} C l

_{17}^{35} C l

and average atomic mass of chlorine is

35.5

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Q. Chlorine exists in two isotopic forms,

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C l - 35

but its atomic mass is

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_{17}^{35} C l

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