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NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

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Question : 32
Total: 36
Use the data given in the following table to calculate the molar mass of naturally occurring argon isotopes :
Isotope Isotopic molar massAbundance
36
‌
Ar		 35.96755 gmol–1 0.337 %
38
‌
Ar		 37.96272 gmol–1 0.063 %
40
‌
Ar		 39.9624 gmol–199.600 %

Solution:  
Molar mass of naturally occurring argon isotopes
=
35.96755×0.337+37.96272×0.063+39.9624×99.600
0.337+0.063+99.600

=
12.12+2.39+3980.255
100
 =
3994.765
100
 = 39.94 mol−1
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