At 298 K, a particular reaction has an equilibrium constant of . Which statement best…

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

Problem

At 298 K, a particular reaction has an equilibrium constant of

K=3.0\times10^{5}

. Which statement best describes the standard Gibbs free-energy change

\Delta G^{\circ}

for this reaction? (a)

\Delta G^{\circ}

is large and positive (magnitude about

30\;\text{kJ mol}^{-1}

). (b)

\Delta G^{\circ}

is approximately zero (within

\pm 3\;\text{kJ mol}^{-1}

). (c)

\Delta G^{\circ}

is large and negative (magnitude about

30\;\text{kJ mol}^{-1}

). (d)

\Delta G^{\circ}

is moderately negative (between

0

and

20\;\text{kJ mol}^{-1}

in magnitude).