Chemistry

Chemistry

Problem

A cell is constructed as Mg(s)∣Mg2+(1 M)  ∣∣  Fe2+(1 M)∣Fe(s)\text{Mg}(s)\mid\text{Mg}^{2+}(1\,\text{M})\;||\;\text{Fe}^{2+}(1\,\text{M})\mid\text{Fe}(s). The measured standard cell potential is Ecell∘=+0.24 VE^\circ_{\text{cell}} = +0.24\,\text{V}, and two electrons are transferred in the overall reaction. Which of the following gives the numerical value of ΔG∘\Delta G^\circ for the cell reaction and correctly identifies the type of cell? a) ΔG∘≈+4.6×104 J;\Delta G^\circ \approx +4.6 \times 10^{4}\,\text{J}; the cell is electrolytic b) ΔG∘≈−2.3×104 J;\Delta G^\circ \approx -2.3 \times 10^{4}\,\text{J}; the cell is galvanic c) ΔG∘≈−4.6×104 J;\Delta G^\circ \approx -4.6 \times 10^{4}\,\text{J}; the cell is galvanic d) ΔG∘≈−4.6×104 J;\Delta G^\circ \approx -4.6 \times 10^{4}\,\text{J}; the cell is electrolytic

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