"Lithium has two isotopes. Lithium-6 has an actual mass of 6.015 g/mol and lithium-7 has a mass of 7.016 g/mol. In any sample of lithium atoms, 7.59% will be lithium-6 and 92.41% will be lithium-7. Calculate the average molar mass of lithium.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 122QRT
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"Lithium has two isotopes. Lithium-6 has an actual mass of 6.015 g/mol and lithium-7 has a mass of 7.016 g/mol. In any sample of lithium atoms, 7.59% will be lithium-6 and 92.41% will be lithium-7. Calculate the average molar mass of lithium.

Expert Solution
Step 1

Given: There are two naturally occurring isotopes of lithium.

Molar mass of isotope 1 i.e. lithium-6 = 6.015 g/mol.

The abundance of isotope 1 = 7.59 %

Molar mass of isotope 2 i.e. lithium-7 = 7.016 g/mol.

And the abundance of isotope 2 i.e. lithium-7 = 92.41 %

 

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