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Chemistry, 15.04.2020 04:15 debk

An unkown element has been found to occur in two different stable isotopes. One isotope has an abundance of 57.21 percent and has a mass of 120.9 amu. The other isotope has an abundance of 42.79 percent and has a mass of 122.9 amu. What is the average atomic mass of the unknown element?

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