# The atomic weight of Ga is 69.72 amu. There are only two naturally occurring isotopes of gallium: #"^69Ga# with a weight of 69.0 amu, and #"^71Ga# with a weight of 71.0 amu. What is approximate natural abundance of the #"^71Ga# isotope?

##### 1 Answer

Jun 6, 2017

The natural abundance is

#### Explanation:

Let the percentage of the isotope

Then,

The percentage of the isotope

We write the mass balance equation

Therefore,

The percentage of the isotope