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Question

Chlorine has two naturally occurring isotopes, 35Cl and 37Cl. If the atomic mass of Cl is 35.45, the ratio of natural abundance of 35Cl and 37Cl is closest to:

A
3.5:1
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B
3:1
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C
2.5:1
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D
4:1
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Solution

The correct option is B 3:1
The percent abundance of Cl35 and Cl37 is equal to 100.

Let abundance of 35Cl=x and abundance of 37Cl=100x.

As we know,
Atomic weight of 35Cl= 34.9689
Atomic weight of 37Cl= 36.9695
Atomic mass of Cl= 35.45

Average atomic mass = 34.9689(x)+36.9695(100x)100=35.45

x=76%

Abundance of Cl35 = 76%
Abundance of Cl37 = 24%

Hence, the ratio of their natural abundance is approximately equal to 3:1.

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