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

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

Part A 2Fe3+(aq)+3Sn(s)→2Fe(s)+3Sn2+(aq) Express the energy change in kilojoules to two significant figures.

Part B O2(g)+2H2O(l)+2Cu(s)→4OH−(aq)+2Cu2+(aq) Express the energy change in kilojoules to one significant figure.

Part C Br2(l)+2I−(aq)→2Br−(aq)+I2(s) Express the energy change in kilojoules to two significant figures.