The standard emf of the cell

CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

The standard emf of the cell,

\text{Cd(s)} \parallel \text{CdCl}_2(\text{aq}) (0.1\text{ M}) \parallel \text{AgCl(s)} \mid \text{Ag(s)}

in which the cell reaction is,

\text{Cd(s)} + 2\text{AgCl(s)} \longrightarrow 2\text{Ag(s)} + \text{Cd}^{2+}(\text{aq}) + 2\text{Cl}^-(\text{aq})

is 0.6915 V at

0^\circ\text{C}

and 0.6753 V at

25^\circ\text{C}

. The

\Delta H^\circ

of the reaction at

25^\circ\text{C}

is: (a) -176 kJ (b) -234.7 kJ (c) +123.5 kJ (d) -167.6 kJ