In the button cells widely used in watches and other devices the following reaction takesplace Chapter 3: Electrochemistry Chemistry Class 12 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. Question 6:In the button cells widely used in watches and other devices the following reaction takesplace: Zn(s) + Ag2O(s) + H2O(l) → Zn2+(aq) + 2Ag(s) + 2OH−(aq) Determine and for the reaction. is solved by our expert teachers. You can get ncert solutions and notes for class 12 chapter 3 absolutely free. NCERT Solutions for class 12 Chemistry Chapter 3: Electrochemistry is very essencial for getting good marks in CBSE Board examinations
Question 6:In the button cells widely used in watches and other devices the following reaction takesplace:
Zn(s) + Ag2O(s) + H2O(l) → Zn2+(aq) + 2Ag(s) + 2OH−(aq)
Determine and for the reaction.
Answer:
The formula of standard cell potential is
E°cell = E° right – E°left
Use this link to get all values
http://ncerthelp.blogspot.in/2013/04/the-standard-electrode-potentials-at.html
E°cell = 0.344 – ( – 0.76)
E°cell = 0.344+0.076 V
E°cell = +1.104 V
In balanced reaction there are 2 electron are transferring so that n = 2
Faraday constant, F = 96500 C mol−1
E°cell = + 1.104 V
Use formula
∆rGθ = – nFE°cell
Plug the value we get
Then, = −2 × 96500 C mol−1 × 1.104 V
= −212304 CV mol−1
= −212304J mol−1
= −212.304kJ mol−1
= −213.04 kJ
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