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CBSE-IX-Science

11: 2-Structure of the Atom

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  • #11
    The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes in the sample?
    Ans : Since average atomic mass =

    16.2=

    1620 =

    2x= 1800 - 1620

    x = 180/2 = 90

    When 90% is the X-16 sample so for X-18 sample % = 100-90=10%