申論題

26.  Redox chemistry

(26A, 5%) Balance the following redox reaction under acidic conditions and indicate the oxidizing agent and the reducing agent: (1)

(26B, 2%) Write down the expression of the equilibrium constant K. for reaction (1) after balancing.

(26C, 3%) The reaction (1) after balancing has a standard electromotive force (E⁰) of 0.56V. Calculate the value of the equilibrium constant K. at 25°C. 

Planck constant h = 6.62608 x J s

 Rydberg constant RH = 2.180 × J

Avogadro constant Na = 6.02214 ×

Faraday constant F = 96485 C

Ideal gas constant R = 0.08206 L atm = 62.36 L torr = 8.314 J

 △G° = ΔΗ° - TASO

△G° = -RTln K = -nFE° (cell) 

Energy levels of hydrogenic atom:

Boiling-point elevation:

Freezing-point depression:

First-order reaction: [A] =

Second-order reaction: 1/[A] = 1/[A]₀ + kt

Arrhenius equation: k =