SELECT * FROM question_mgmt as q WHERE id=1807 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=58 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

How much electricity is required in coulomb for the oxidation of

(i) 1 mol of H2O to O2.

(ii) 1 mol of FeO to Fe2O3.

Answer:

(i) According to the question,

H2O  → H2 + ½ O2

Now, we can write:

O2- → ½ O2 + 2e-

Electricity required for the oxidation of 1 mol of H2O to O2 = 2 F

= 2 × 96487 C

= 192974 C

(ii) According to the question,

Fe2+  →   Fe3+ + e-1

Electricity required for the oxidation of 1 mol of FeO to Fe2O3

= 1 F

= 96487 C


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