aaliyahgrier09 aaliyahgrier09 30-01-2020 Chemistry contestada Calculate the average atomic mass of an element whose two isotopes naturally occur in the following proportions and have the following atomic masses: 25.0% and 64.9amu; 75.0% and 67.1 amu. 56.56 amu 66.55 amu O 1093.73 amu
