# What is the percentage occurrence of the isotopes #""^35Cl#, and #""^37Cl# is the average atomic mass of chlorine is #35.45*"amu"#?

##### 1 Answer

Feb 11, 2017

The weighted average of the isotopes is

#### Explanation:

And thus

This is one equation in 2 unknowns. However, we can supply another equation because WE ASSUME that there are only the two isotopes of

And thus we get the equation:

So

And

And

And thus

Capisce?