Textbook ExpertVerified Tutor
2 Nov 2021
Given information
Lithium has two naturally occurring isotopes.
The atomic mass of lithium- 
is 
amu
The atomic mass of lithium-
is 
amu.
Step-by-step explanation
Step 1.
Let the fractional abundance of lithium- is 
.
Let the fractional abundance of lithium- is 
.
We know that, average atomic mass of lithium = 
amu
The atomic mass of lithium- is amu.
The atomic mass of lithium- is amu.
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