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. 7237 amu
B) 86.8013 amu
C) 86.8220 amu
D) 86.8621 amu
E) 86.9411 amu
Correct Answer:
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