SELECT * FROM question_mgmt as q WHERE id=1786 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:

In the button cells widely used in watches and other devices the following reaction takes place:

Zn(s) + Ag2O(s) + H2O(l)  → Zn2+(aq) + 2Ag(s) + 2OH - (aq)

Determine and for the reaction.

Answer:

Eø  = 1.104 V

We know that,

ΔrGø = -nFEø

= - 2 × 96487 × 1.04

= - 213043.296 J

= - 213.04 kJ


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