Rubidium Consists of Two Naturally Occurring Isotopes Rubidium-85 and Rubidium-87

Rubidium consists of two naturally occurring isotopes rubidium-85 and rubidium-87. Rubidium-85 (⁸⁵Rb) has an isotopic mass of 84.9117 amu and a 72.15% abundance. Rubidium-87(⁸⁷Rb) has a 27.85% abundance. The atomic weight of rubidium is 85.4768 amu. Determine the isotopic mass of ⁸⁷Rb?

A) 86.72371 amu
B) 86.8013 amu
C) 86.8220 amu
D) 86.8621 amu
E) 86.9085 amu

Correct Answer:

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