24. A sample of 0.6760 g of an unknown compound containing barium ions (Ba?") is dissolved in water and treated with an excess of NazSO4. If the masses of the BaSO4 precipitate formed is 0.4105 g, what is the percent by mass of Ba in the original unknown compound? A. 37.52 % 25. What is the concetration (in molarity )of a NaOH solution if 25 0 ml of thn salı B. 35.72 % C. 32.57% D. 37.72 % mooded te

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