Thermodynamics Solutions: #34

34.* (1991 3 2)

A. Use the data below to calculate the cell potential E⁰ for the reaction

H₂O₂ + 2e- + 2H⁺ --> 2H₂O	E⁰ = 1.77V
O₂ + 2H⁺ + 2e^- --> H₂O₂	E⁰ = 0.70V

E=+1.77V

E=-0.70V

E=+1.01V (spontaneous)

B. What is the equilibrium constant for this reaction?

C. Contrary to intuition, dilute solutions of H₂O₂ are often stable. Offer an explanation for this.

There must be a kinetic barrier for the reaction which prevents dilute solutions of H₂O₂ from decomposing.