E°cell = cathode — anode
• Larger E°cell = cathode
• Smaller E°cell = anode
BUT if an equation or a reaction is given:
Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.)
3 Cl2(g) + 2 Fe(s) → 6 Cl-(aq) + 2 Fe3+(aq)
Cl2(g) + 2e- → 2 Cl-(aq) E° = +1.36 V
Fe3+(aq) + 3e- → Fe(s) E° = -0.04 V
A) +4.16 V
B) -1.40 V
C) -1.32 V
D) +1.32 V
E) +1.40 V
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