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# Atomic mass of boron is 10.81 amu. It has two isotopes with 80% and 20% abundance respectively. The atomic mass of one isotope is 11, the mass of other isotope is:21.8210.8111.0110.05

A
10.81
B
10.05
C
21.82
D
11.01
Solution
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#### Atomic mass of Boron =10.81duppose mass of other isotope=mmass of one isotope =1111×80%+m×20%=10.8111×80+m×20100=10.81880+20m=108120 m=1081−880=201m=20120=10.05

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