RISE Science - Chemistry Practice Questions - RISE Science - Chemistry (Utah SEEd High School) Exam

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Naturally occurring chlorine exists as two stable isotopes: Chlorine-35 (atomic mass 34.97 amu, abundance 75.77%) and Chlorine-37 (atomic mass 36.97 amu, abundance 24.23%). What is the calculated average atomic mass of chlorine?

35.45 amu 36.00 amu 35.97 amu 34.97 amu

Correct Answer:

35.45 amu

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