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14 July, 22:10

Indium (In) is made up of 95.7% 115In and 4.3% 113In. The atomic mass of 113In is 112.904 amu. The atomic mass of 115In is 114.904 amu. What is the average atomic mass of a sample of indium?

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  1. 15 July, 00:36
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    amu In = 114.818 amu

    Explanation:

    Indium (In):

    ∴ 95.7% 115In

    ∴ 4.3% 113In

    ∴ atomic mass 113In = 112.904 amu

    ∴ atomic mass 115In = 114.904 amu

    average atomic mass (In):

    ⇒ amu In = (0.957) (114.904 amu) + (0.043) (112.902 amu)

    ⇒ amu In = 109.963 amu + 4.855 amu

    ⇒ amu In = 114.818 amu
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