Excess (NH4)2SO4 ( NH 4 ) 2 SO 4 was added to a 70.0 mL 70.0 mL solution containing BaCl2 BaCl 2 (MW=208.23 g/mol). ( MW = 208.23 g/mol ) . The resulting BaSO4 BaSO 4 (MW=233.43 g/mol) ( MW = 233.43 g/mol ) precipitate had a mass of 0.2192 g 0.2192 g after it was filtered and dried. What is the molarity of BaCl2 BaCl 2 in the solution?

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