Answered

The atomic masses of the two stable isotopes of boron, (_5^10)B(19.78 percent) and (_5^11)B (80.22 percent), are 10.0129 amu and 11.0093 amu, respectively.Calculate the average atomic mass of boron.

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Answer:

(.1978)(10.0129 amu)  +  (.8022)(11.0093 amu) =10.81 amu

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