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(a) Two stable isotopes of lithium ""(3)...

(a) Two stable isotopes of lithium `""_(3)^(6)Li" and "_(3)^(7)` 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.
(b) Boron has two stable isotopes, `""_(5)^(10)B" and """_(5)^(11)B` . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of `""_(5)^(10)B" and """_(5)^(11)B`.

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