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

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

            Zn (s)+ Ag_{2}O(s)+H_{2}O(l)\rightarrow Zn^{2+}(aq)+2Ag(s)+2OH^{-}(aq)

         Determine \Delta_{r}G^{e} and E^{e} for the reaction.

Answers (1)

best_answer

The given reaction is obtained from :- 

                          

So the Eocell  can be obtained directly.

                                                        E_{cell}^{\circ} = 0.76 - (-0.344) = 1.104\ V

Now for free energy calculation, we have :- 

                                          \Delta G_r^{\circ} = -nFE^{\circ}_{cell}

or                                                   = -2\times96487\times1.04

or                                                   = - 213043.29\ J

or                                                   = - 213.04\ KJ

Posted by

Devendra Khairwa

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