Thallium(I) sulfate is an active ingredient in rat poison. We can analyze a sample for the mass percentage for this active ingredient by adding potassium iodide to precipitate yellow thallium(I) iodide. If the sample of rat poison weighed 999.5 mg and you obtained 279.4 mg of the dry precipitate, then what is the mass percentage of the thallium(I) sulfate in the rat poison?

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