Answer:
The average atomic mass of gallium in this scenario is 69.8.
Explanation:
Finding the average atomic mass of an element can be done by multiplying the occurrence of each isotope by their respective atomic masses. The expression will look like [tex](0.60*69)+(0.40*71).[/tex] This will simplify to 69.8, which means that the average atomic mass of gallium would be that amount.
