Question: What is the standard cell potential (E°) for a galvanic cell with half-reactions: Zn²⁺ + 2e⁻ → Zn (E° = -0.76 V) and Cu²⁺ + 2e⁻ → Cu (E° = +0.34 V)?

Options:

1. -1.10 V
2. -0.42 V
3. 0.42 V
4. 1.10 V

Correct Answer: 0.42 V

Solution:

E°cell = E°cathode - E°anode = 0.34 V - (-0.76 V) = 1.10 V.