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Question

Chlorine has two isotopes, 3517Cl and 3717Cl. Calculate the average atomic mass of chlorine atom (in a.m.u.) based on the given information.

S.NoIsotopesPercentage abundance (%)13517Cl7523717Cl25


  1. 35.5

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Solution

The correct option is A 35.5
Average atomic mass =(Atomic mass of isotope 1 x percentage abundance of isotope 1 + Atomic mass of isotope 2 x percentage abundance of isotope 2 )

Average atomic mass =35 ×75100 + 37×25100
= 35.5 a.m.u.

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