Question

Question #6dadc

Answer 1

The average atomic mass of the given sample of bromine is `80`.

Explanation:

Since they both make up an abundance of `50%`, just add `79` and `81`, then divide by `2`.

`79+81=160`

`160/2=80`

The following is probably what your teacher wants you to do. Multiply the given mass numbers by the decimal form for `50%`, 0.50, and add them together.

`(0.50xx79)+(0.50xx81)=`

`39.5+40.5=80`