Question

Calculate the atomic mass (average) of chlorine using the following data:
`{:(,,"% natural abundance",,"Molar mass"),(.^(35)Cl,,75.77,,34.9689),(.^(37)Cl,,24.23,,36.9659):}`

Answer 1

It is given two isotopes of bromine are 79/35Br(49.7%) and 81/35Br(50.3%). Then, the average atomic mass of bromine atom is given by
`79xx(49.7)/(100)+81xx(50.3)/(100)`
`=(3926.3)/(100)+(4074.3)/(100)`
`(8000.6)/(100)`
=80.006u