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16 June, 19:02

Rubidium has two naturally occurring isotopes, rubidium - 85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium - 87 (atomic mass = 86.9092; abundance = 27.85%). Calculate the atomic weight of rubidium

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  1. 16 June, 19:27
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    The answer to your question is: 85.458 amu

    Explanation:

    data

    Rubidium-85 A = 84.9118 amu abundance = 72.15%

    Rubidium - 87 A = 86.9092 amu abundance = 27.85%

    Atomic weight = ?

    Atomic weight = 84.9118 (0.7215) + 86.9092 (0.2785)

    Atomic weight = 61.2538 + 24.2042

    Atomic weight = 85.458 amu
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