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# a crystal of the mineral troegerite (UO2)3 (AsO4)2 X 12H2O ( FM =1304 amu ) contains ____% uranium by mass?

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- 1 decade agoFavorite Answer
Since you can't directly obtain the Ar of uranium from the periodic table, so you would have to subtract away the mass of the other constituent elements.

% mass of the other consituents: [3(16 x 2) + 2(74.9 + 4 (16)) + 12(18.0)] / 1304 x 100= 45.23%

Thus the % mass of uranium: 54.77%

PS i believe the Ar of the uranium used here is 238

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