Boron has two isotopes with masses 10.13 u and 11.01 u and abundance of19.77% and 80.23% respectively. What is the average atomic mass of boron?

Boron has two isotopes with masses 10.13 u and 11.01 u and abundance of19.77% and 80.23% respectively. What is the average atomic mass of boron?

Ans: – The average atomic mass of boron is = (mass of A × percentage + mass of B × percentage)

= (10.13×19.77/100 + 11.01×80.23/100)

=10.81u.

 

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