Problem: Use tabulated half-cell potentials to calculate ΔG°rxn for each of the following reactions at 25 °C.2Fe3+(aq) + 3Sn(s) → 2Fe(s) + 3Sn2+(aq) Express the energy change in kilojoules to two significant figures.

FREE Expert Solution

The relationship between ΔG and Ecell is:


G=-nFEcell


Calculate E°cell.

Fe3+(aq) + 3 e- → Al(s)                       E°cell = – 0.04 V                   cathode

Sn2+(aq) + 2 e- → Pb(s)                     E°cell = – 0.14 V                    anode


E°cell=E°cathode-E°anodeE°cell=-0.04 V --0.14 VEcell=-0.04V+0.14 V  

  E°cell = 0.1 V


Calculate ΔG:

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Problem Details

Use tabulated half-cell potentials to calculate ΔG°rxn for each of the following reactions at 25 °C.

2Fe3+(aq) + 3Sn(s) → 2Fe(s) + 3Sn2+(aq) 

Express the energy change in kilojoules to two significant figures.

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