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A sample of 0.6760 g of an unknown compound containing barium ions (Ba ) is dissolved in water and treated with an excess of Na2SO4. If the mass of the BaSO4 precipitate formed is 0.4105 g, what is the percent by mass of Ba in the original unknown compound?
The net ionic equation for the precipitation reaction is the following:
2+ 2-
Ba (aq) + SO4 (aq) ? BaSO4(s)

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