A spontaneous galvanic cell operates using the half-reactions below

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

Problem

A spontaneous galvanic cell operates using the half-reactions below, written as they occur in the cell. Fe

^{3+}

+ e

^{-}

→ Fe

^{2+}

E^{\circ}=+0.77\,\text{V}

2 I

^{-}

→ I

_2

+ 2 e

^{-}

E^{\circ}=-0.54\,\text{V}

What is the standard cell potential

E^{\circ}_{\text{cell}}

at 298 K? (a)

+1.31\,\text{V}

(b)

+0.23\,\text{V}

(c)

-0.23\,\text{V}

(d)

+0.54\,\text{V}