In the button cells widely used in watches and other devices the following reaction takes place:
$Z n (s) + A g_{2} O (s) + H_{2} O (l) \to Z n^{2 +} (a q) + 2 A g (s) + 2 O H^{-} (a q)$
Determine $Δ_{r} G^{θ}$ and $E^{θ}$ for the reaction.

Question

In the button cells widely used in watches and other devices the following reaction takes place:
$Z n (s) + A g_{2} O (s) + H_{2} O (l) \to Z n^{2 +} (a q) + 2 A g (s) + 2 O H^{-} (a q)$
Determine $Δ_{r} G^{θ}$ and $E^{θ}$ for the reaction.

Toppr Admin · Accepted Answer

E0cell-E0cathode-x2212-E0anode-EoAg-x2212-EoZn-0-344-x2212-x2212-0-76-1-104 V-x394-G0-x2212-nFE0cell-x2212-2-xD7-96500-xD7-1-104-x2212-213072J-x2212-213kJ

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 ΔrGθ and Eθ for the reaction.

E0cell=E0cathode−E0anode=EoAg−EoZn=0.344−(−0.76)=1.104 VΔG0=−nFE0cell=−2×96500×1.104=−213072J=−213kJ

In the button cells widely used in watches and other devices the following reaction takes place:
$Z n (s) + A g_{2} O (s) + H_{2} O (l) \to Z n^{2 +} (a q) + 2 A g (s) + 2 O H^{-} (a q)$
Determine $Δ_{r} G^{θ}$ and $E^{θ}$ for the reaction.

$E_{c e l l}^{0} = E_{c a t h o d e}^{0} - E_{a n o d e}^{0} = E_{A g}^{o} - E_{Z n}^{o} = 0.344 - (- 0.76) = 1.104$ V
$Δ G^{0} = - n F E_{c e l l}^{0} = - 2 \times 96500 \times 1.104 = - 213072 J = - 213 k J$