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20-05-2023
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12. Bromine has two naturally isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu and its natural abundance is 49.31 %. Calculate the mass and natural abundance of Br-79. (Ans 78.92 amu, 50.69 % )

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