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18. A precipitation reaction is performed and 43.5 g of lead(II) iodide is collected when 90.2 g of a solid mixture containing lead(I) nitrate is mixed with excess potassium iodide. What is the mass percent of lead(II) nitrate in the mixture? KI(aq) + Pb (NO3)2 (aq) → PbI2(s) + KNO3(aq)