At 298 K, the gas-phase decomposition of substance X has an equilibrium constant of .…

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

Problem

At 298 K, the gas-phase decomposition of substance X has an equilibrium constant of

K=2.5\times10^{-8}

. Calculate the standard Gibbs free-energy change

\Delta G^{\circ}

for the reaction in kJ mol⁻¹. (R = 8.314 J mol⁻¹ K⁻¹) (a)

-43\ \text{kJ mol}^{-1}

(b)

+3.6\ \text{kJ mol}^{-1}

(c)

+43\ \text{kJ mol}^{-1}

(d)

+19\ \text{kJ mol}^{-1}