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22 April, 22:15

Calculate the atomic mass of gallium, symbol Ga. Gallium has two isotopes: Ga-69 and Ga-71. The relative abundance of Ga-69 is 60.12% and its atomic mass is 68.9257 amu. The relative abundance of Ga-71 is 39.88% and its atomic mass is 70.9249 amu

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  1. 22 April, 22:26
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    The atomic mass of gallium (Ga) = 69.723 g/mol

    Explanation:

    Given: Two isotopes of Gallium (Ga) are Gallium-69 (⁶⁹Ga) and Gallium-71 (⁷¹Ga)

    For ⁶⁹Ga:

    Relative abundance = 60.12% = 60.12 : 100 = 0.6012; Atomic mass = 68.9257 g/mol

    For ⁷¹Ga:

    Relative abundance = 39.88% = 39.88 : 100 = 0.3988; Atomic mass = 70.9249 g/mol

    ∴ The atomic mass of Ga = (Relative abundance of ⁶⁹Ga * Atomic mass of ⁶⁹Ga) + (Relative abundance of ⁷¹Ga * Atomic mass of ⁷¹Ga)

    ⇒ Atomic mass of Ga = (0.6012 * 68.9257 g/mol) + (0.3988 * 70.9249 g/mol) = 69.723 g/mol

    Therefore, the atomic mass of gallium (Ga) = 69.723 g/mol
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