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4 April, 01:24

a fictitious element X is composed of 25.0 percent of the isotope 48X, 20.0 percent of the isotope 49X and 55.0 percent of the isotope 50X. estimate the atomic mass of element X

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  1. 4 April, 03:10
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    Answer is: atomic mass of element X is 49.3.

    ω (⁴⁸X) = 25.0% : 100%.

    ω (⁴⁸X) = 0.25.

    Average atomic mass of element X =

    Ar (⁴⁸X) · ω (⁴⁸X) + Ar (⁴⁹X) · ω (⁴⁹X) + Ar (⁵⁰X) · ω (⁵⁰X).

    Average atomic mass of element X = 48 · 0.25 + 49 · 0.20 + 50 · 0.55.

    Average atomic mass of element X = 12.0 + 9.80 + 27.5.

    Average atomic mass of element X = 49.3.
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