One or more options correct
A galvanic cell is at 298 K with V. Take and V. Select the correct statement(s).
- A. The emf of the cell is V.
- B. for the cell reaction (per mole of Zn) is kJ.
- C. The equilibrium constant of the cell reaction is about .
- D. If the concentration is also reduced to M, the emf stays at V.
Show answer and solution
Answer: A
Nernst equation for : V, so A is correct. Then kJ; the value kJ is , so B is wrong. At equilibrium , so and C (which halves the exponent by forgetting ) is wrong. If both concentrations are 0.01 M the ratio is 1, the log term vanishes and V, not 1.16 V, so D is wrong. Each option therefore tests a different slip: ignoring the concentration term, mixing standard and actual free energy, dropping n in the equilibrium constant, or mishandling the reaction quotient.
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