A 1.40 g mixture of Na₂SO4 and Cr₂(SO4)3 was dissolved in water, and an excess of Ba(NO3)2 was added to precipitate all of the sulfate
ions. The BaSO4 was collected and dried, and weighed to give 2.36 g of BaSO4. How much Na₂SO4 and Cr₂(SO4)3 was in the sample?