What is the E°_cell for the cell represented by the combination of the following half-reactions?
2Hg²⁺(aq) + 2e^-
Hg₂²⁺(aq) ;E°= 0.92 V
Cr³⁺ (aq) + 3e^-
Cr(s) ;E°= -0.74 V

Question

What is the E°_cell for the cell represented by the combination of the following half-reactions? 2Hg²⁺(aq)+ 2e^- Hg₂²⁺(aq);E°= 0.92 V Cr³⁺ (aq)+ 3e^- Cr(s);E°= -0.74 V

Quizplus · Accepted Answer

The overall cell reaction can be obtained by adding the half-reactions and canceling out the electrons:
2Cr(s) + 3HgS2 → 2Hg(l) + Cr2S3
The standard cell potential can be calculated by adding the standard reduction potentials:
E°cell = E°Cr2S3 + E°Hg - E°Cr - 3E°HgS2
E°cell = (-0.74 V) + (0.85 V) - 0.00 V - 3(0.92 V) = 1.66 V
Therefore, the answer is D, 1.66 V.

What Is the E°cell for the Cell Represented by the Combination

What Is the E°_cell for the Cell Represented by the Combination