An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 113 amu and 115 amu, with natural abundances of 5% and 95%, respectively. Calculate its average atomic mass. Report your answer to 1 decimal place.

Its average atomic mass is 114.9 amu

Explanation:

Mass of isotope 1 = 113 amu

% abundance of isotope 1 = 5% =

Mass of isotope 2 = 115 amu

% abundance of isotope 2 = 95% =

Formula used for average atomic mass of an element :

Thus its average atomic mass is 114.9 amu

idk what the question is about