Question
Le lithium naturel est un mélange des deux isotopes ${ }^6 \mathrm{Li}$ et ${ }^7 \mathrm{Li}$ dont les masses atomiques sont respectivement 6,017 et 7,018. Sa masse atomique est 6,943 . Quelle est sa composition isotopique (\% de chaque isotope)?
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Lithium has two isotopes, ${ }^{6} \mathrm{Li}$ and ${ }^{7} \mathrm{Li}$ of isotopic masses 6.015 and 7.016 respectively. The atomic mass of lithium is $6.941 .$ Calculate the natural abundance of the two isotopes.
Lithium, Li, is 7.6$\%$ lithium-6 and 92.4$\%$ lithium- $7 .$ Determine the average atomic mass of lithium.
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Isotopes
Lithium, Li, is 7.6$\%$ lithium-6 and 92.4$\%$ lithium $-7 .$ Determine the average atomic mass of lithium.
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