An Element Has Two Naturally Occurring Isotopes

question 45

Multiple Choice

An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of 184.953 amu. The other has an abundance of 62.6% and an isotopic mass  of 186.956 amu. What is the atomic weight of the element?

• A) 185.702 amu
• B) 185.954 amu
• C) 186.207 amu
• D) 186.956 amu
• E) 190.234 amu

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