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4 November, 17:09

The atomic masses of the two stable isotopes of boron; boron-10 (natural abundance:19.78%) and boron-11 (natural abundance:80.22%) are 10.0129 amu and 11.0093 amu, respectively. calculate the average atomic mass of boron

10.41 amu

10.95 amu

10.81 amu

10.72 amu

10.13 amu

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  1. 4 November, 17:51
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    (19.78 x 10) + (80.22 x 11) all of them divided by 100 = 10.81 amu
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