Hydrogen peroxide was catalytically decomoposed and 75.3 mL ofoxygen gas was col

Question

Hydrogen peroxide was catalytically decomoposed and 75.3 mL ofoxygen gas was collected over water at 25 degrees celsius and 742torr. What mass of oxygen was collected? (Pwater =24 torr at 25 degrees celsius) A. 0.00291 g B. 0.0931 g C. 0.0962 h D. 0.0993 g E. 0.962 g Hydrogen peroxide was catalytically decomoposed and 75.3 mL ofoxygen gas was collected over water at 25 degrees celsius and 742torr. What mass of oxygen was collected? (Pwater =24 torr at 25 degrees celsius) A. 0.00291 g B. 0.0931 g C. 0.0962 h D. 0.0993 g E. 0.962 g

Explanation / Answer

Pv=nRT given v=75.3mL T=25 deg C+273=298K P=742torr P2=24torr n=? M=16g/mol solve P=742-24=718torr /760 =0.94474atm n=Pv/RT n=(0.0753L)(0.94474atm)/(0.08206Latm/kmol)(298K) n=0.07114/24.454 n=0.00291mol n=m/M m=(0.00291)(32)=0.0931g therefore b is correct

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