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Two stable isotopes of lithium .(3)^(6)L...

Two stable isotopes of lithium `._(3)^(6)Li` and `._(3)^(7)Li` have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and7.01600 u, respectively. Find the atomic mass of lithium.

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(a) 6.941 u (b) 19.9%, 80.1%
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