Question #6dadc

1 Answer
Meave60
Sep 10, 2017

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#

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