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Standard electrode potential for the cell with cell reaction Zn(s)+Cu2+(aq)Zn2+(aq)+Cu(s)Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s) is 1.1 V1.1\text{ V}. Calculate the standard Gibbs energy change for the cell reaction. (Given F=96487 C mol1F = 96487\text{ C mol}^{–1})

A

–200.27 kJ mol–1

B

–212.27 kJ mol–1

C

–212.27 J mol–1

D

–200.27 J mol–1

Step-by-Step Solution

The standard Gibbs energy change (ΔrG\Delta_r G^{\circ}) is related to the standard cell potential (EcellE^{\circ}_{cell}) by the equation: ΔrG=nFEcell\Delta_r G^{\circ} = -nFE^{\circ}_{cell} For the given cell reaction, Zn(s)+Cu2+(aq)Zn2+(aq)+Cu(s)Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s), the number of electrons transferred (nn) is 22. Given: Ecell=1.1 VE^{\circ}_{cell} = 1.1\text{ V} F=96487 C mol1F = 96487\text{ C mol}^{-1} Substitute the values into the equation: ΔrG=2×96487 C mol1×1.1 V\Delta_r G^{\circ} = -2 \times 96487\text{ C mol}^{-1} \times 1.1\text{ V} ΔrG=212271.4 J mol1\Delta_r G^{\circ} = -212271.4\text{ J mol}^{-1} ΔrG=212.2714 kJ mol1\Delta_r G^{\circ} = -212.2714\text{ kJ mol}^{-1} Therefore, the standard Gibbs energy change for the cell reaction is 212.27 kJ mol1-212.27\text{ kJ mol}^{-1}.

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