Hydrogen Peroxide May Decompose to Form Water and Oxygen Gas

question 121

Multiple Choice

Hydrogen peroxide may decompose to form water and oxygen gas according to the following reaction. 2H₂O₂(g) 2H₂O(g) + O₂(g)
In a particular experiment, 1.75 moles of H₂O₂ were placed in a 2.5-L reaction chamber at 307ºC. After equilibrium was reached, 1.20 moles of H₂O₂ remained. What is K_c for the reaction?

• A) 2.0 × 10^-4
• B) 2.3 × 10^-2
• C) 2.4 × 10^-3
• D) 5.5 × 10^-3
• E) 3.9 × 10^-4

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