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  • 19.9% of  au boron atoms are , 80.1 % are  . The appoxima

19.9% of  au boron atoms are _{5}^{10}B, 80.1 % are  _{5}^{11}B. The appoximate atomic mass of Boron is :

 

Option: 1

10.6


Option: 2

10.7


Option: 3

10.8


Option: 4

10.9


Answers (1)

best_answer

In 100%  the atomic mass 

19.9% of  au boron atoms are _{5}^{10}B  and  80.1 % are  _{5}^{11}B.


Atomic\: mass = \frac{19.9\times 10+80.1\times 11}{100}

= \frac{1080}{100}= 10.8

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Gunjita

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