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Get Answers to all your Questions
- #Chemistry
- #Class 11
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- #Some basic concepts in chemistry
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In a sample of 400 lithium atoms, it is found that 30 atoms are lithium-6 (6.015 g/mol) and 370 atoms are lithium-7 (7.016 g/mol). Calculate the average atomic mass (in g/mol) of lithium.
Option: 1
5.97
Option: 2
6.94
Option: 3
6
Option: 4
7.2
Answers (1)
1) Calculation of percent abundance for each isotope:
Li-6: 30/400 = 0.075
Li-7: 370/400 = 0.925
2) Calculation of average atomic weight:
x = (6.015) (0.075) + (7.016) (0.925)
x = 6.94 g/mol
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