Lithium has two known stable isotopes- lithium-6 and lithium-7. Lithium-6 has an isotopic mass of 6.015 amu and percent abundance of 7.59%; lithium-7 has a mass of 7.016 amu at 92.41 % abundance. Calculate the average atomic mass of lithium.
For isotope 1 (lithium-6), atomic mass = "6.015\\times 7.59\/100=0.4565385"
For lithium-7, atomic mass"=7.016\\times 92.41\/100=6.4834856"
Average atomic mass of lithium"=0.4565385+6.4834856=6.9400241 amu"
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