A hypothetical element consists of two isotopes of masses 69.95 amu and 71.95 amu with abundances of 25.7% and 74.3%,respectively.What is the average atomic mass of this element? September 21, 2022 by 8i9x6 70.95 amu 69.95 amu 70.5 amu 71.4 amu 71.95 amu See Answer 71.4 amu