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In a periodic table the average atomic m...

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are `""_(12)^(24)Mg (23.98504u), ""_(12)^(25)Mg (24.98584u) and ""_(12)^(26)Mg (25.98259u)`. The natural abundance of `""_(12)^(24)Mg` is 78.99% by mass. Calculate the abundances of other two isotopes.

Text Solution

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`""_(12)^(25)Mg:9.3%, ""_(12)^(26)Mg:11.7%`
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Knowledge Check

  • Chlorine has two isotopes having masses 34.98u and 36.98u. The relative abundances of these isotopes are 75.4 and 24.6 percent. Then average mass of chlorine atom is….u

    A
    34.91
    B
    35
    C
    35.47
    D
    34.01

  • Chlorine has two isotopes having masses 34.98 u and 36.98 u. The relative abundances of these isotopes are 75.4 and 24.6 percent. Then average mass of chlorine atom is ….. u.

    A
    `34.91`
    B
    35
    C
    `35.47`
    D
    `34.01`

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