Question

Q 3. 96 Rubidium is used in “atomic clocks” and other precise electronic equipment. The average atomic mass of 85 37Rb (84.912 amu) and 87 37 Rb (86.909 amu) is 85.47 amu. Calculate the natural abundances of the rubidium isotopes. 

Answer 1

$Abundances =\frac{(85.37+84.912)(87.37+86.909}{85.47}$