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

Answer:

M = 87.71 amu

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,

$M=0.50\%\ \text{of}\ 84+9.9\%\ \text{of}\ 86+7\%\ \text{of}\ 87+82.6\%\ \text{of}\ 88\\\\M=\dfrac{0.5}{100}\times 84+\dfrac{9.9}{100}\times 86+\dfrac{7}{100}\times 87+\dfrac{82.6}{100}\times 88\\\\M=87.71\ \text{amu}$

So, the  atomic mass of  Strontium is 87.71 amu.