A 21.25 g of a mixture of the solid salts, sodium chloride and lead II nitrate, is added to distilled water and stirred. The precipitate that is formed is filtered and dried. Its mass was determined to be 11.06 g. Analysis of the remaining solution shoed that the following ions were present: Pb2+, Na+ and NO3-. Determine the percent (by mass) of lead (II) nitrate in the mixture.  Assume 100 % yield

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