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OpenStudy (anonymous):

A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion barium sulfate, BaSO4. How many grams of barium ion are in a 403 mg sample of the precipitate? What is the mass percentage of barium in the compound? So far, I have the balanced equation: Na2+SO4 + Ba = BaSO4 + 2Na

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