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Hydrogen Peroxide (H2O2) Decomposes Catalytically in the Presence of Metal

Question 20

Multiple Choice

Hydrogen peroxide (H2O2) decomposes catalytically in the presence of metal ions and enzymes called peroxidases. You may have noticed this reaction occurring if you use a drugstore solution of hydrogen peroxide as a mouthwash or antiseptic. If a 250 mL bottle of hydrogen peroxide solution containing 3.0% H2O2 (by mass) completely decomposes, how many liters of oxygen gas would it generate? Assume that 1 mol of gas occupies a volume of 22.4 L and that the density of the solution is 1.0 g/mL. The reaction is 2H2O2(aq) 2H2O( Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) decomposes catalytically in the presence of metal ions and enzymes called peroxidases. You may have noticed this reaction occurring if you use a drugstore solution of hydrogen peroxide as a mouthwash or antiseptic. If a 250 mL bottle of hydrogen peroxide solution containing 3.0% H<sub>2</sub>O<sub>2</sub> (by mass) completely decomposes, how many liters of oxygen gas would it generate? Assume that 1 mol of gas occupies a volume of 22.4 L and that the density of the solution is 1.0 g/mL. The reaction is 2H<sub>2</sub>O<sub>2</sub>(aq) <font face= symbol ></font> 2H<sub>2</sub>O( ) + O<sub>2</sub>(g) A) 2.5 L B) 4.9 L C) 9.9 L D) 7.4 L E) 0.22 L ) + O2(g)


A) 2.5 L
B) 4.9 L
C) 9.9 L
D) 7.4 L
E) 0.22 L

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