Question

10. If bromine atom is available in the form of, say, two isotopes
Br (49.7%) and Br (50.3%), calculate the average atomic
mass of bromine atom.​

Answer 1

$\huge \fbox \red{❥ Answer}$

= [79 × 49.7%] + [81 × 50.3%] 

=  79 × 49.7/100 + 81 × 50.3/100

= 79 × 0.497 + 81 × 0.503

=  39.263 + 40.743

= 80.006 a.m.u

• I Hope it's Helpful.