Consider the spontaneous reaction at Standard reduction potentials: Calculate per…

CHEMISTRY · Single correct · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

Consider the spontaneous reaction at

25^{\circ}\text{C}

\text{Cl}_2(g) + 2\text{Br}^-(aq) \rightarrow 2\text{Cl}^-(aq) + \text{Br}_2(l)

Standard reduction potentials:

\text{Cl}_2(g) + 2e^- \rightarrow 2\text{Cl}^-(aq)\quad E^{\circ} = +1.36\,\text{V}

\text{Br}_2(l) + 2e^- \rightarrow 2\text{Br}^-(aq)\quad E^{\circ} = +1.07\,\text{V}

Calculate

\Delta G^{\circ}

per mole of

\text{Cl}_2

consumed (in kJ). (Use

F = 9.65 \times 10^{4}\,\text{C mol}^{-1}

.) (a)

-1.12 \times 10^{2}\,\text{kJ}

(b)

+5.6 \times 10^{1}\,\text{kJ}

(c)

-5.6 \times 10^{1}\,\text{kJ}

(d)

-2.8 \times 10^{1}\,\text{kJ}