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    Evil dead Posts: 116, Reputation: -5
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    Apr 2, 2007, 01:46 PM
    Relative Abundance of an Isotope
    I have 2 isotopes of Gallium: 69/31Ga & 71/31 Ga

    *numerator = Atomic Number
    *denominator = Atomic Mass

    The molar mass of a sample of gallium is 69.8 g mol-1

    Calculate the percenateg abundance.

    I've done this before but I've forgotten:rolleyes:



    ALSO

    CuCO3 + H2SO4 ----> CuSO4 + CO2 + H2O.

    3.98g of Copper (II) Sulphate-5-water CuSO4.5H2O was obtained from solution.

    Calculate the percentage yield of the reaction.

    *other info you might need: 25cm3 of 1.0mol dm-3 of H2SO4

    My attempt:

    100 x [3.98/249.5]

    = 1.60% abundance

    seems very wrong, help

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