## Chemistry 10th Edition

Atomic mass of the element = $96.056 amu$
Mass of Isotope 1 = $94.9 amu$ % abundance of Isotope 1 = $12.4\%$ Mass of Isotope 2 = $95.9 amu$ % abundance of Isotope 2 = $73.6\%$ Mass of Isotope 3 = $97.9amu$ % abundance of Isotope 3 = $14.0\%$ Atomic mass of an element is the weighted average of the masses of the constituent isotopes. Therefore, atomic mass of the element is: Atomic mass of the element = $0.124(94.9 amu) + 0.736(95.9 amu) + 0.14 (97.9 amu)$ Atomic mass of the element = $96.056amu$