What is the percentage by mass of barium, Chemistry

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What is the percentage by mass of barium

A sample of 0.6760 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated in excess Na2SO4. If the mass of BaSO4 precipitate that forms is 0.4105 g. What is the percentage by mass of Barium in the original unknown compound?
(Ba = 137.33; S = 32; O = 16)

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Chemistry: What is the percentage by mass of barium

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