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11 August, 23:44

The element lead (Pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, and 207.97663 amu. The relative abundances of these four isotopes are 1.4,24.1,22.1, and 52.4 %, respectively. From these data, calculate the atomic weight of lead.

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  1. 11 August, 23:47
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    The atomic weight of lead is 207.2169 amu

    Explanation:

    Step 1: Data given

    Lead has 4 isotopes:

    ⇒ 203.97302 = 1.4 %

    ⇒ 205.97444 = 24.1 %

    ⇒ 206.97587 = 22.1 %

    ⇒ 207.97663 = 52.4 %

    Step 2: Calculate the atomic weight of lead

    Atomic weight = 203.97302 * 0.014 + 205.97444*0.241 + 206.97587 * 0.221 + 207.97663 * 0.524

    Atomic weight = 207.21688371 ≈ 207.2169 amu

    The atomic weight of lead is 207.2169 amu
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