what is the natural abundance of gallium-71 70.925amu?

Answer 1

Hi Katherine! We can find the answer to this question by finding atomic mass of gallium and the atomic masses of it's naturally occurring isotopes.

Gallium has 2 naturally occurring isotopes:

Gallium-71 and Gallium-69

Gallium-71 has an atomic mass of 70.925

Gallium-69 has an atomic mass of 68.926

The average atomic mass of gallium is 69.723

Using these we can form the equation 70.925x + 68.926(1-x) = 69.723

Where x is the abundance of Gallium-71

If you solve for x, you get x = 0.39870

So the percent abundance is 39.870%

Hope this helps! :P