kateeb7175 kateeb7175 18-01-2021 Chemistry contestada There are three isotopes of X element (X): X-17 isotope: atomic mass17.2 amu, abundance:78.99% X-18isotope: atomic mass 18.1 amu, abundance 10.00% X-19isotope: atomic mass:19.1 amu, abundance: 11.01% Calculate the average atomic mass of X.