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March 26, 2017

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The element europium exists in nature as two isotopes: 151^Eu has a mass of 150.9196 amu, and 153^Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. Calculate the relative abundance of the two europium isotopes.

  • Chemistry - ,

    x = fraction abundance 151 Eu
    1-x = fraction abundance Eu153.

    150.9196(x) + 152.9209(1-x) = 151.96.
    Solve for x.
    You may convert the fractions to percentages by multiplying each by 100.

  • Chemistry - ,

    thank you Dr Bob!

  • Chemistry - ,

    I don't get it. :'( omg

  • Chemistry - ,

    Ahhhhh it's so confusing...

  • Chemistry - ,

    Uhm........

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