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  • Two stable isotopes of lithium 6 3 Li and 7 3 Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

Q.13.1 Two stable isotopes of lithium _{3}^{6}\textrm{Li} and _{3}^{7}\textrm{Li} have respective abundances of 7.5\; ^{o}/_{o} and 92.5\; ^{o}/_{o}. These isotopes have masses 6.01512 \; u and 7.01600 \; u, respectively. Find the atomic mass of lithium.

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Mass of the two stable isotopes and their respective abundances are 6.01512 \; u and 7.01600 \; u and 7.5\; ^{o}/_{o} and 92.5\; ^{o}/_{o}.

m=\frac{6.01512\times7.5+7.01600\times92.5}{100}

m=6.940934 u

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