GACE Chemistry (712) Practice Questions - GACE Chemistry (6-12) (712) Assessment Exam

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A fictional element has three isotopes: mass 40.9 amu at 10.0% abundance, mass 43.9 amu at 30.0% abundance, and mass 45.9 amu at 60.0% abundance. What is the average atomic mass of this element?

44.8 amu 43.6 amu 42.1 amu 45.9 amu

Correct Answer:

44.8 amu

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