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hydrogen peroxide is used as a cleaning agent in treatment of cuts and abrasions for several reasons. In the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide: BaO2(s)+2HCl(aq)=H2O2(aq)+BaCl2(aq); what amount of hydrogen peroxide should result when 1.50g of barium peroxide is treated with 25.0ML of hydrochloric acid solution containing 0.0272 g of HCl per ML? what mass of which reagent is left unreacted?

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