A radioactive sample contains 32 P (half-life, 14.28 d), 33 S (half-life, 87.2 d), and 59 Fe

Question:

A radioactive sample contains ³²P (half-life, 14.28 d), ³³S (half-life, 87.2 d), and ⁵⁹Fe (half-life, 44.6 d). After 90 d, a sample that originally weighed 8.00 g contains 0.0254 g of ³²P, 1.466 g of ³³S, and 0.744 g of ⁵⁹Fe. What was the percentage composition (by mass) of the original sample?

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