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If 4.57 grams of AgBr was isolated in a gravimetric analysis of a 9.30 gram sample, what is the % Br- by weight in the samples?

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  • chemistry -

    What is the mass of Br?
    moles AgBr = 4.57 grams AgBr x (1 mol AgBr/molar mass AgBr).

    There is 1 mole Br in 1 mole AgBr; therefore, you now have moles Br.

    How many grams Br do you have?
    grams Br = moles Br x atomic mass Br

    What percent is that of the original sample?
    %Br = (grams Br/mass sample)*100 = ??

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