Question

Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of

9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%).
Calculate the atomic mass of
strontium.

Answer 1

M = 87.71 amu

Step-by-step explanation:

The masses of 4 isotopes of Strontium with abundance is as follows :

84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Let M is the atomic mass of Strontium. So,

`M=0.50\%\ \text{of}\ 84+9.9\%\ \text{of}\ 86+7\%\ \text{of}\ 87+82.6\%\ \text{of}\ 88\\\\M=(0.5)/(100)* 84+(9.9)/(100)* 86+(7)/(100)* 87+(82.6)/(100)* 88\\\\M=87.71\ \text{amu}`

So, the atomic mass of Strontium is 87.71 amu.