Rubidium Possesses Two Stable Forms and Has an Average Mass

question 91

Multiple Choice

Rubidium possesses two stable forms and has an average mass of 85.5.⁸⁵Rb has a mass of 84.9 and a percent abundance of 72.2%.What is the mass of the other form of Rb?

• A)86.1 u
• B)85.7 u
• C)88.3 u
• D)87.1 u
• E)89.4 u

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