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8 July, 00:21

Rubidium has two naturally occurring isotopes. The average atomic mass of Rb is 85.4678 amu. If 72.15% of Rb is found as Rb-85 (84.9117 amu), what is the mass of the other isotope?

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  1. 8 July, 04:14
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    x = 86.908 amu

    Explanation:

    Average mass of isotope = 85.4678 amu

    Rb-85 = 84.9117 amu, Percentage = 72.15% = 0.7215

    Other isotope = x, Percentage = 100 - 72.15 = 27.85% = 0.2785

    Average mass = (Percentage * Mass of Rb-85) + (Percentage * Mass of Rb-87)

    85.4678 = (0.7215 * 84.9117) + (0.2785 * x)

    85.4678 = 61.2638 + 0.2785x

    0.2785x = 24.204

    x = 24.204 / 0.2785

    x = 86.908 amu
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