An Element Has Two Naturally Occurring Isotopes

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

Correct Answer:

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