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NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

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Question : 9
Total: 36
Calculate the atomic mass (average) of chlorine using the following data :
% Natural abundance Molar mass
35
‌
Cl		 75.77 34.9689
37
‌
Cl		 24.2336.9659

Solution:  
The atomic mass (average) of chlorine
=
75.77×34.9689+24.23×36.9659
75.77+24.23
 =
2649.59+895.68
100
 =
3545.27
100
 = 35.45 u
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