Question: Variations in average atomic mass may be observed for elements obtained from different sources. Lithium provides an example of this. The isotopic composition of lithium

Variations in average atomic mass may be observed for elements obtained from different sources. Lithium provides an example of this. The isotopic composition of lithium from naturally occurring minerals is 7.5% Li and 92.5% Li, which have masses of 6.01512 amu and 7.01600 amu, respectively. A commercial source of lithium, recycled from a military source, was 3.75% Li (and the rest Li). What is the correct average atomic mass for both of these sources? A) Natural - 6.01512, Commercial - 7.0160 (B) Natural - 6.9409, Commercial - 6.9785 Natural - 6.5156, Commercial - 6.5156 D) Natural -6.2525, Commercial - 6.5257

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