An element has 4 isstopes, the first one has a mass of 202.9 amu and an abundance of 9%, the second isotope has a mass of 206.9 amu and an
abundance of 55%, the third isotope has a mass of 2072 aru and an abundance
of 23%, The final isotope has an atomic mass of 208,9 aru and an aburdance cf
13% Calculate the average atomic massAn element has 3 isotopes, the first one has a mass of 31.9 amu and an
abundance of 55.3%, the second isotope has a mass of 33.0 amu and an
abundance of 20.2%, the third isotope has a mass of 30.2 amu and an abundance
of 24.5%. Calculate the average atomic mass.