A button cell used in watches functions as following- Zn-s- - Ag-2 O-s- - H-2 O -l- -160- -160-2Ag-s- - Zn-2- -aq- - 2OH- -aq- -160-If half cell potentials are- Zn-2- -aq- - 2e - -160- -160- Zn-s-160- - E-0 - -0-76 V- Ag-2 O-s- - H-2 O-l- -160- 2e - -160- -160- 2Ag-s- - 2OH- -aq- E-0 - 0-34 V- -160-The cell potential will be- 1-10 V- 0-42 V- 1-34 V- 0-84 V-

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A button cell...

Question

A button cell used in watches functions as following:

$Z n (s) + A g_{2} O (s) + H_{2} O (l) ⇌ 2 A g (s) + Z n^{2 +} (a q) + 2 O H^{-} (a q)$

If half cell potentials are: $Z n^{2 +} (a q) + 2 e \to Z n (s); E^{0} = - 0.76 V$

$A g_{2} O (s) + H_{2} O (l) 2 e \to 2 A g (s) + 2 O H^{-} (a q), E^{0} = 0.34 V$

The cell potential will be:

1.10 V

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0.42 V

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0.84 V

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1.34 V

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Solution

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Similar questions

Z n (s) + A g_{2} O (s) + H_{2} O (l) ⇌ 2 A g (s) + Z n^{2 +} (a q) + 2 O H^{-} (a q)

Z n^{2 +} (a q) + 2 e^{-} \to Z n (s); E^{\circ} = - 0.76 V

A g_{2} O (s) + H_{2} O (l) + 2 e^{-} \to 2 A g (s) + 2 O H^{-} (a q), E^{\circ} = 0.34 V

Z n (s) + A g_{2} O (s) + H_{2} O (l) ⇌ 2 A g (s) + Z n^{2 +} (a q) + 20 H^{-} (a q)

Z n_{(a q)}^{2 +} + 2 e^{-} \to Z n_{(s)} E^{\circ} = - 0.76 V

A g_{2} O_{(s)} + H_{2} O_{(l)} + 2 e^{-} \to 2 A g (s) + 2 O H_{(a q)}^{-} E^{\circ} = 0.34 V

Z n (s) + A g_{2} O (s) + H_{2} O (l) ⇌ 2 A g (s) + Z n^{2 +} (a q) + 20 H^{-} (a q)

Z n_{(a q)}^{2 +} + 2 e^{-} \to Z n_{(s)} E^{\circ} = - 0.76 V

A g_{2} O_{(s)} + H_{2} O_{(l)} + 2 e^{-} \to 2 A g (s) + 2 O H_{(a q)}^{-} E^{\circ} = 0.34 V

△ G^{\circ}

Z n (s) + A g_{2} O (s) + H_{2} O (l) ⇌ Z n^{2 +} (a q) + 2 A g (s) + 2 O H^{-} (a q)

E_{A g^{+} / A g}^{\circ} = + 0.80 V

E_{Z n^{2 +} / Z N}^{\circ} = - 0.76 V

Δ_{r} G^{o}

Z n_{(s)} + A g_{2} O_{(s)} + H_{2} O_{(l)} \to Z n_{(a q)}^{2 +} + 2 A g_{(s)} + 2 O H_{(a q)}^{-}

[E_{A g_{2} O / A g}^{o} = 0.344 V, E_{Z n^{2 +} / Z n}^{o} = - 0.76 V]

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