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A hypothetical element has two main isotopes. One has a mass of 33 amu and the other has a mass of 35 amu. If the atomic weight of this element is 33.33 amu, what is the percent abundance of the 35 amu isotope? 1. 83.30% 2. 22.70% 3. 80.30% 4. 19.70% 5. 77.30% 6. 16.70%