A hypothetical element has two main iso- topes. One has a mass of 73 amu and the other has a mass of 75 amu. If the atomic weight of this element is 73.80 amu, what is the percent abundance of the 75 amu isotope? 1. 45.92% 2. 39.92% 3. 60.08% 4. 54.08% 5. 42.92% .0 6. 57.08%

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