Consider the reaction 2 Fe³⁺(aq) + 2 I⁻(aq) → 2 Fe²⁺(aq) + I₂(aq) occurring in an…

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

Problem

Consider the reaction 2 Fe³⁺(aq) + 2 I⁻(aq) → 2 Fe²⁺(aq) + I₂(aq) occurring in an electrochemical cell at 298 K. The standard cell potential is

E^\circ_{cell} = +0.23\,\text{V}

, and the cell involves

n = 2

electrons. The ion concentrations are [Fe³⁺] = 0.10 M, [Fe²⁺] = 1.0 M, [I⁻] = 0.10 M, and [I₂] = 0.010 M. What is

\Delta G

(in kJ) for the reaction under these conditions? (

R = 8.314\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

F = 96\,485\,\text{C}\,\text{mol}^{-1}

) (a)

+33\,\text{kJ}

(b)

-44\,\text{kJ}

(c)

-33\,\text{kJ}

(d)

-56\,\text{kJ}