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Calculation of average atomic mass: The ...

Calculation of average atomic mass: The atomic attoms fo the two stbale isopes of boron, `._(5)^(10)B (19.78%)` and `._(11)^(5)B (80.22%)`, are `10.0129 u` and `11.0093 u`, respectively, Calculate the average atomic mass of boron.
Strategy : The atomic mass of an element existing in nature as istopes is the weighted average of the istope masses, Thus, multiply the fracton of each isotope by its mass and add these numbers to obtain the mass of born.

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Broron has two stable isotopes, ._(5)^(10)B and ._(5)^(11)B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of ._(5)^(10)B and ._(5)^(11)B .