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Oksi-84 [34.3K]
3 years ago
12

Lithium has two isotopes.

Chemistry
1 answer:
Harman [31]3 years ago
6 0
This is in the assumption that these are the only 2 isotopes. This means that:
abundance of Li-6 = X
abundance of Li-7 = 1-X

Hence from your equations 
6.9409 = (X * 6.015121amu) + ((1-X) * <span>7.016003amu</span>)
Solve for X = 0.075 or 7.50%
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