(a) Use the values of E for reactions 16.32 and 16.33 to show that H 2 O...

(a) Use the values of Eº for reactions 16.32 and 16.33 to show that H₂O₂ is thermodynamically unstable with respect to decomposition into H₂O and O₂.

(b) ‘20 Volume’ H₂O₂ is so called because 1 volume of the solution liberates 20 volumes of O₂ when it decomposes. If the volumes are measured at 273K and 1 bar pressure, what is the concentration of the solution expressed in grams of H₂O₂ per dm³?

Equations

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H₂O₂ + 2H+ + 2e¯¯ ⇒ 2H₂O O₂ + 2H+ + 2e = H₂O₂ E° +1.78 V = (16.32) E = +0.70 V (16.33)