Four hypothetical reactions at have the following standard free-energy changes: •…

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

Four hypothetical reactions at 298 K298\,\text{K} have the following standard free-energy changes: • Reaction W: ΔG∘=+1.2 kJ mol−1\Delta G^{\circ}=+1.2\,\text{kJ mol}^{-1} • Reaction X: ΔG∘=0 kJ mol−1\Delta G^{\circ}=0\,\text{kJ mol}^{-1} • Reaction Y: ΔG∘=−0.8 kJ mol−1\Delta G^{\circ}=-0.8\,\text{kJ mol}^{-1} • Reaction Z: ΔG∘=−30 kJ mol−1\Delta G^{\circ}=-30\,\text{kJ mol}^{-1} Which pair of reactions is most likely to reach an equilibrium mixture containing nearly equal amounts of reactants and products? (a) W and X (b) X and Y (c) Y and Z (d) W and Y

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