From the following data ZH ^ + ( aq )+ 1 2 O _ 2 ( ~g )+2 e ^ - H _ 2 O ( o ) E ^ a =1.23…

Chemistry · NEET · NTA Exams — Electrochemistry

From the following data

\(\mathrm{ZH}^{+}(\mathrm{aq})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g})+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{o}) \mathrm{E}^{\mathrm{a}}=1.23 \mathrm{~V}\);

 \(F e^{2+}(a q)+2 e^{-} \rightarrow F e(5) ; E^{3}=-0.44 \mathrm{~V}\)

show that ∆G° for 2Fe(s) + 4H+(aq) + O2(g) →2Fe2+(aq) + 2H2O(l) is:

  1. - 322.3 kJ mol-1
  2. - 483.5 kJ mol-1
  3. - 644.6 kJ mol-1
  4. 644.6 kJ mol-1

Answer

(C) - 644.6 kJ mol -1

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