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ChemistryChemistry
29 September, 23:18

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?

a. 113.909 amu

b. 114.5 amu

c. 114.818 amu

d. + 666+115.00 amu

+2
Answers (1)
  1. 29 September, 23:45
    0
    The sample of indium, has an average atomic mass of 114.818 amu

    Explanation:

    Step 1: Data given

    Indium is made of 95.7 % 115In and 4.3% 113In

    113In has an atomic mass of 112.904 amu

    115In has an atomic mass of 114.904amu

    Step 2: Calculate the average atomic mass

    The average atomic mass = X

    0.957 * 114.904 + 0.043 * 112.904 = X

    109.963 + 4.855 = X

    X = 114.818

    The sample of indium, has an average atomic mass of 114.818 amu
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Home » Chemistry » 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? a. 113.909 amu b. 114.5 amu c. 114.818 amu d. + 666+115.
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