The atomic masses of 79 br 35 (50.69 percent) and 81 br 35 (49.31 percent) are 78.9183361 amu and 80.916289 amu, respectively. c

Question

Brut [27]

4 years ago

7

The atomic masses of 79 br 35 (50.69 percent) and 81 br 35 (49.31 percent) are 78.9183361 amu and 80.916289 amu, respectively. c

alculate the average atomic mass of bromine. the percentages in parentheses denote the relative abundances.

Chemistry

1 answer:

mestny [16] · Answer 1 · 2021-12-24T08:33:50+03:00

These 2 isotopes are all of bromine that is naturally found (their percentages add up to 100%). In order to calculate the mean atomic mass, we can use the following calculation: $M_{79} *percent_{79}+M_{81}*percent_{81}$ . This yields an average atomic mass of 79.903 amu. This procedure is general; whenever we have many types F of a specific genre G, the mean of the genre G can be calculated by:
$\sum{T_i*p_i}$
where $p_i$ is the proportion of type i in the genre G. In this example, Br79 and Br81 are the 2 types and the genre is Bromine.