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

question 28

Multiple Choice

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

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