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In this lesson, we will learn how to calculate the relative atomic masses of elements based on the relative abundance of their isotopes.
Q1:
A sample of lithium contains a mixture of 7 L i and 8 L i isotopes, with atomic masses of 6.01512 u and 7.01600 u, respectively. The sample is 4 . 2 1 % 7 L i by mass.
Calculate to 3 significant figures the average atomic mass of the sample.
A second sample of lithium also contains a mixture of 7 L i and 8 L i but displays a higher abundance of 7 L i . How does the average atomic mass of this sample compare with that of the first?
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