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  • 19.9%of all boron atoms are 5B10 , 80.1% are 5B11. The approximate atomic mass of boron is

19.9%of all boron atoms are 5B10 , 80.1% are 5B11. The approximate atomic mass of boron is

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\text{Atomic mass} =10 \times 19.9+ 80.1 \times \frac{11}{100} = \frac{1080.1}{100} = 10.801

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