For a certain reaction at

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

Problem

298\,\text{K}

, the standard free-energy change is

\Delta G^\circ = +1.2\,\text{kJ mol}^{-1}

. Which statement best describes the composition of the equilibrium mixture under these conditions? (a)

K\approx1

, so the equilibrium mixture will contain roughly equal amounts of reactants and products. (b) Because

\Delta G^{\circ}>0

, essentially no reaction will occur and the system will remain entirely as reactants. (c) Since

K\approx0.6<1

, the equilibrium mixture will contain more reactants than products, but appreciable amounts of both. (d) The positive

\Delta G^{\circ}

means

K>1

, so the mixture will consist mainly of products.