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1 May, 07:29

Naturally occurring bromine is composed of 50.7% of 79Br and 49.3% of 81Br. Atoms of 79Br have a mass of 78.9183 u and those of 81Br have a mass of 80.9163 u. Calculate the average atomic mass of bromine. Enter your answer with 3 significant digits.

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Answers (2)
  1. 1 May, 08:16
    0
    The atomic mass of bromine is 79.9 u

    Explanation:

    Step 1: Data given

    Isotopes of Bromine:

    79Br = 50.7 % with a mass of 78.9183 u

    81Br = 49.3 % with a mass of 80.9163 u

    Step 2: Calculate the average atomic mass of bromine

    Atomic mass of bromine = 0.507*78.9183 + 0.493*80.9163

    Atomic mass of bromine = 79.9 u

    The atomic mass of bromine is 79.9 u
  2. 1 May, 09:55
    0
    79.9 u

    Explanation:

    Given data

    Isotope Mass Abundance

    ⁷⁹Br 78.9183 u 50.7% (0.507)

    ⁸¹Br 80.9163 u 49.3% (0.493)

    We can calculate the average atomic mass (am) of bromine using the following expression.

    am = ∑mi * abi

    where,

    mi: mass of the isotope

    abi: abundance of the isotope

    am = 78.9183 u * 0.507 + 80.9163 u * 0.493

    am = 79.9 u
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