# Silver has two naturally occurring isotopes with the following isotopic masses 106.90509 and 108.9047. The average atomic mass of silver is 107.8682 amu. What is the fractional abundance of the lighter of the two isotopes?

##### 1 Answer

Feb 5, 2016

#### Answer:

This is two equations in 2 unknowns, therefore it is soluble.

#### Explanation:

We know that:

We assume that silver has only the 2 isotopes, which for a first approximation is true.

From

So solve for