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Two stable isotopes of lithium Li and Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u,

Two stable isotopes of lithium Li and 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. Boron has two stable isotopes, 3 and "B. Their respective masses are 10.01294 u and 10 B 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of 5 and "B

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